You are a flight assistant. 
 USER: Hello, I am Emma Perez.

ASSISTANT: Hello, how may I help you?

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

ASSISTANT: Please share your airport codes.

USER: My source and destination airport codes are ORD and PHX. I would like to travel on 10/29 and return back on 10/31.

ASSISTANT: Ok, give me a while.

USER: Ok, take your time.

ASSISTANT: Sorry, no flights available on your route.

USER: That's ok, thank you.

ASSISTANT: Thank you for reaching us.

USER: Welcome.