You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Nicholas Davis here.

ASSISTANT: How may I help you today?

USER: I would like to deviate from DFW to PHX, so please help me out in booking the ticket.

ASSISTANT: Sure, I am here to help you with that. Can I know your travelling dates?

USER: My trip dates will be 03/20 and 03/22.

ASSISTANT: Ok, please wait for a minute.

USER: Sure.

ASSISTANT: Sorry to say that, there are no flight's available based on your travelling dates.

USER: That's ok, thank you.

ASSISTANT: Thank you for reaching us.