You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: I am Robert Edwards, want to travel from JFK to DFW. My travelling dates are from 08/27 to 08/29.

ASSISTANT: Ok, please wait for a while.

USER: OK.

ASSISTANT: Sorry, there is no flights available.

USER: That's fine. Thank you.

ASSISTANT: Most welcome.