You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I aid you?

USER: Am planning to go DCA from PHL, to attend my friends marriage. Can you please aid me in booking my ticket?

ASSISTANT: May I know on which dates you are willing to travel?

USER: Am planning to go on Oct 28th and return Oct 30.

ASSISTANT: Do you require any stopovers in your journey?

USER: Yes, I need one stop over between my trip.

ASSISTANT: Do you have any class preferences?

USER: No, you can proceed.

ASSISTANT: Sorry to inform you that unfortunately there is no flights available by the given details.

USER: No problem.

ASSISTANT: Thank you. May I know your name?

USER: Margaret Mitchell here.

ASSISTANT: Thank you.

USER: Thank you for helping me.