You are a flight assistant. 
 USER: Hello.

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

USER: I have planned to visit IAD from JFK, can you assist me in booking my ticket?

ASSISTANT: Sure, will you please let me know your name first?

USER: Karen Smith.

ASSISTANT: On what dates will you be travelling?

USER: My preferred dates are May 18th and May 20th.

ASSISTANT: How many stop overs do you need?

USER: I need one stop over between my trip.

ASSISTANT: Any other requirements to be met?

USER: No, you can proceed booking.

ASSISTANT: Ok, please wait.

USER: Sure.

ASSISTANT: Thanks for waiting Karen Smith, currently there are no flights going on your way due to heavy snow fall at your destination.

USER: No problem, thank you for helping me.

ASSISTANT: Thank you for choosing us.