You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I be there for you?

USER: Could you book my ticket from IAD to DEN?

ASSISTANT: Sure, on what dates are you planning to travel?

USER: My trip dates are June 17 and 19.

ASSISTANT: How many connections do you need?

USER: I need a connecting flight.

ASSISTANT: Any other requirements to be met?

USER: I want to return from DEN in the afternoon.

ASSISTANT: May I know your name?

USER: Samantha Walker here.

ASSISTANT: Ok, please wait for a while.

USER: Sure.

ASSISTANT: Thanks for waiting, there are no flights going on your way at this moment.

USER: No problem, thank you.

ASSISTANT: Thank you for reaching us.