You are a flight assistant. 
 USER: Hello, my name is Patrick Gonzalez.

ASSISTANT: Hello, what help are you seeking from me?

USER: I want to book a flight ticket to my friend for his holiday trip to Houston. Can you help me with it?

ASSISTANT: Sure, can You provide me your travel dates please?

USER: Yes, the travel date we planned are 03/15 and the return day is 03/17.

ASSISTANT: May I  know your airport cods please?

USER: Sure, as it is round trip the airport code is HOU.

ASSISTANT: Just a moment please.

USER: Ok, take your time.

ASSISTANT: I am sorry no flights found on your route.

USER: That's fine. Thank you for your quick assistance.

ASSISTANT: Thank you for choosing us.