You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Anthony Phillips.

ASSISTANT: Phillips, how may I assist you at this moment?

USER: Can you help me to book a flight with 0 connection on 10/21?

ASSISTANT: Sure, I will help you with booking, can you share your travelling airport codes?

USER: I would like to attend a marriage at ORD, so please book a flight from LAG.

ASSISTANT: When you are going to return to LAG?

USER: I will be return on 10/23.

ASSISTANT: May I know your exact source airport code?

USER: My source is LGA.

ASSISTANT: Sorry for the inconvenience, no flights as per your details.

USER: Ok, no issues.

ASSISTANT: Thank you for reaching us.

USER: Thank you for your time.

ASSISTANT: You are welcome.\.