You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: I am Nancy Phillips, want to travel from PHL to PHX. Can you please help me in ticket booking?

ASSISTANT: Sure, may I know your trip dates please?

USER: My trip dates are from 08/22 to 08/24.

ASSISTANT: Do you have any class preference?

USER: No.

ASSISTANT: Sorry, there is no flight available as per your request.

USER: It's ok, thank you.

ASSISTANT: Most welcome.