You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, what help can I do for you today?

USER: I want the ticket from DC-DCA to DC-IAD.Can you please help me out?

ASSISTANT: Sure, I am here to help you.

USER: Thank you.

ASSISTANT: What are your planning dates to visit that place?

USER: The visiting dates are from 11/27 to 11/29.

ASSISTANT: Just wait for a minute to check it.

USER: Sure.

ASSISTANT: Can you provide your name for reserving your ticket?

USER: Sure, I'm Helen Moore.

ASSISTANT: Helen, there is no flights moving to your location because, they are busy in travelling to other locations.

USER: Ok, no problem.

ASSISTANT: Thank for contacting us with your query.

USER: Thank you for your information.

ASSISTANT: Welcome.