You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I guide you today?

USER: Please help me out in booking the ticket from LAS to IAD.

ASSISTANT: Sure, please share me your journey dates.

USER: My trip dates will be Jan 28 to Jan 30.

ASSISTANT: Do you have any limit on number of connections?

USER: I need a connecting flight.

ASSISTANT: May I know about your airline preference for your journey?

USER: I am comfortable with any airline.

ASSISTANT: Do you have any more specifications?

USER: Depart time must be in the afternoon.

ASSISTANT: Let me know your name to proceed further for documentation process.

USER: Stephen Young is my name.

ASSISTANT: We regret to say that, we have not any flights running on your planned trip dates.

USER: That's ok, thank you.

ASSISTANT: Thanks for opting us, have a happy journey.