user: I'm in the running to win British Airways Venice flights thanks to #competition #giveaway #FlyBA
agent: We would love to have you back!
user: I'll be on board tomorrow :)
agent: Wonderful. We can't wait to welcome you on board then.
user: I can't check in. App says there is no ticket number. Despite having picked seat etc I have never received an email receipt for the booking
agent: I'm sorry to hear you're having difficulty checking in. Can you DM us your booking ref, email address and telephone number so that 1/2 2/2 we can look at this for you?
user: Hi I have messaged you, thanks Many thanks for sorting this out :)
agent: No problem, William. You know where we are if we can help with anything else.

The customer says that he is in the running to win British Airways Venice flights but the app says there is no ticket number and adds that he have never received an email receipt for the booking. The agent apologises since the customer is facing difficulty in Checking in and asks to DM the booking ref, email address and telephone number to assist further.
### Instruction: Below is a conversation between a human and an AI agent. Write a summary of the conversation.

### Input:
user: I'm in the running to win British Airways Venice flights thanks to #competition #giveaway #FlyBA
agent: We would love to have you back!
user: I'll be on board tomorrow :)
agent: Wonderful. We can't wait to welcome you on board then.
user: I can't check in. App says there is no ticket number. Despite having picked seat etc I have never received an email receipt for the booking
agent: I'm sorry to hear you're having difficulty checking in. Can you DM us your booking ref, email address and telephone number so that 1/2 2/2 we can look at this for you?
user: Hi I have messaged you, thanks Many thanks for sorting this out :)
agent: No problem, William. You know where we are if we can help with anything else.

### Response:
The customer says that he is in the running to win British Airways Venice flights but the app says there is no ticket number and adds that he have never received an email receipt for the booking. The agent apologises since the customer is facing difficulty in Checking in and asks to DM the booking ref, email address and telephone number to assist further.