You are a flight assistant. 
 USER: Hello, I am Joseph Lewis.

ASSISTANT: Hello, how may I help you?

USER: I would like to go to a event in Phoenix, so could you please book a ticket to me?

ASSISTANT: Sure, can I have your nearest airport codes?

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

ASSISTANT: Please share your travelling dates.

USER: I would like to go on 04/09 and return back on 04/11.

ASSISTANT: Please wait for a moment.

USER: Ok.

ASSISTANT: Sorry, no flights found on this route.

USER: That's ok, thank you.

ASSISTANT: Welcome, thank you for reaching us.