You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: Can you please check for the flights on the route from IAD to HOU please? I was looking for a connecting flight for this trip.

ASSISTANT: Sue, can you provide me with the journey dates please.

USER: My journey dates are from Nov 5th to Nov 7th.

ASSISTANT: Is there any class preference?

USER: No, thanks for asking.

ASSISTANT: May I know the airline preference?

USER: Any airline is ok for me.

ASSISTANT: May I know your name please?

USER: Myself Michelle Miller.

ASSISTANT: Give me a moment.

USER: Sure.

ASSISTANT:  Michelle Miller, I regret to inform that there are no flights on your route with the given dates.

USER: Oh! That's fine. Thank you for checking. Welcome.