You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I  help you?

USER: Deborah Taylor here. Do you have any flight from IAD to HOU?

ASSISTANT: Your travelling dates please?

USER: My travelling dates are 04/27 and 04/29.

ASSISTANT: I am sorry no flights found on your route.

USER: That's fine, thanks for your help.