You are a flight assistant. 
 USER: Hello, I am Lisa Collins.

ASSISTANT: Hello, how may I assist you?

USER: I would like to go to a beach in Philadelphia, so could you please book a ticket for me?

ASSISTANT: Sure. Please send your journey dates.

USER: I would like to go on 05/08 and return back on 05/10.

ASSISTANT: Can I have your nearby airport codes?

USER: My source and destination airport codes are HOU and PHL.

ASSISTANT: Sorry, there is no connecting flight available with your requirements.

USER: That's ok, thank you for checking.

ASSISTANT: Thank you for reaching us.