You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you?

USER: I am Ruth Robinson. Can you help me to find a flight from DCA to LAX?

ASSISTANT: Sure, may I know your travel dates?

USER: My travelling dates are June, 19 and June, 21.

ASSISTANT: Ok, please wait for a while.

USER: Sure.

ASSISTANT: Sorry, there were no flights found on your route.

USER: That's fine, thanks for your information anyways.

ASSISTANT: Thank you for reaching us.