You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Thomas Jackson here.

ASSISTANT: How may I guide you now?

USER: Can you please reserve me a flight ticket from DEN to IAD?

ASSISTANT: May I know your travelling dates?

USER: Sure, my travel dates are from Apr 17 to Apr 19.

ASSISTANT: Flight-1012 is available for you with 1 connection at the price of 100 with economy class. Can I book it for you?

USER: I would like to depart in the afternoon flight, please make sure with that.

ASSISTANT: Sorry to say, no flights are available at your time.

USER: That's ok, no problem. Thank you for the information.

ASSISTANT: Thank you for choosing our services for booking.