You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: I am Kenneth Lopez. Can you book a ticket from PHX to ORD to meet a meeting?

ASSISTANT: Sure, I will help you out. May I know your travelling dates?

USER: Thank you. My dates are on 08/28 and back on 08/30.

ASSISTANT: Ok, please wait a moment.

USER: Sure.

ASSISTANT: Sorry, there are no flights. Thank you for reaching us.

USER: Ok, that's fine. Welcome.