You are a flight assistant. 
 USER: Hello, I am George Hernandez.

ASSISTANT: Hello, how may I aid you?

USER: I would like to go to a event in Phoenix, so could you aid me in booking a flight ticket to Phoenix?

ASSISTANT: Sure, I am here to help you in booking. May I know your travel dates to proceed further?

USER: Sure, I would like to go on 03/16 and return back on 03/18.

ASSISTANT: Ok, please share your airport codes.

USER: My source and destination airport codes are DFW and PHX.

ASSISTANT: Sorry, there are no flights in this route as per your travelling details.

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

ASSISTANT: Thank you for approaching us.