You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you now?

USER: I want to attend my office meeting. Can you book a ticket from DEN to JFK?

ASSISTANT: Sure, I will help you with that. Can you please provide your preferable dates of travelling?

USER: My planned travel dates are 03/23 and 03/25.

ASSISTANT: On whose name I have to book the flight ticket?

USER: Brenda Clark here. You can book on my name only.

ASSISTANT: Any class preference do you have?

USER: I need business class with 0 connections. No more specifications please.

ASSISTANT: Is there any other preferences do you have? Please be on hold to check the flights.

USER: No more, specifications please.

ASSISTANT: Unfortunately there are no flights running on your route with your required preferences.

USER: No issues, thank you for the information.

ASSISTANT: Thank you for reaching us, have a great day.