You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: I am Andrew Young, want to travel from IAD to PHX.

ASSISTANT: May I know your journey dates?

USER: My travelling dates are from 07/05 to 07/07.

ASSISTANT: Sorry, there is no flights available.

USER: It's ok, thank you........

ASSISTANT: Most welcome.