You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How best can I guide you now?

USER: Can you aid me in booking a flight ticket from DEN to IAD?

ASSISTANT: Sure, I am happy to help you. May I know your travelling dates, please?

USER: Sure, I would like to go on Feb 29th and return back on Mar 02nd.

ASSISTANT: Do you have any connection limit for your connection limit?

USER: Make sure it is a single connecting flight.

ASSISTANT: May I know about your other requirements, if any?

USER: Make sure it is a normal-cost airline.

ASSISTANT: Please, share me your good name to proceed further for documentation purpose.

USER: Myself Anthony Scott.

ASSISTANT: We are sorry to say that, we have not found any flights running on your desired routes.

USER: That's ok, thank you for checking.

ASSISTANT: Thank you for reaching us.

USER: Welcome.