You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Barbara Carter here.

ASSISTANT: How can I aid you today?

USER: I want to meet my father-in-law, could you book my ticket from IAD to PHX?

ASSISTANT: Sure, I'll help you with that. May I know your travel dates please?

USER: My itinerary dates are 07/12 and 07/14.

ASSISTANT: Ok, please wait for a moment.

USER: Sure.

ASSISTANT: Carter, there are no flights available for you on those dates.

USER: It's ok, thank you.

ASSISTANT: Thank you for choosing us.