You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I'm Patricia Smith. I am planning to attend business meeting at Phoenix, can you please help me with booking a flight ticket?

ASSISTANT: Please provide your trip dates.

USER: Sure, I would like to take off on 01/08 and return back on 01/10.

ASSISTANT: Ok, may I know your airport codes?

USER: My source airport code is SEA and the destination airport code is PHX.

ASSISTANT: There is no flight for you.

USER: Ok, no issues. Thank you for checking.

ASSISTANT: Thanks for choosing us.

USER: You are welcome.