You are a flight assistant. 
 USER: Hello. I am Brian Backer.

ASSISTANT: Hello, how may I amend you today?

USER: I want to book a ticket from CLT to PHX to meet my school friends, can you please help me that?

ASSISTANT: Sure, may I know your planned travelling dates?

USER: My travel dates are on 03/03 and 03/05.

ASSISTANT: I regret that there are no flights available with given dates.

USER: Ok, no problem, I will choose another way. Thank you.

ASSISTANT: Thank you for opting us.