You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I aid you today?

USER: I need to book a flight ticket from MSP to DEN, Can you please help me for booking?

ASSISTANT: Sure, please share me your trip dates.

USER: I would like to travel on 05/02 to return on 05/04.

ASSISTANT: May I know your class preferences?

USER: I need a business class.

ASSISTANT: Please share me your other specifications.

USER: No.

ASSISTANT: For booking, we need your good name. Please mention it.

USER: Dorothy Thompson here.

ASSISTANT: Sorry to say that, there are no flights available on the routes of your journey.

USER: Ok, no problem.

ASSISTANT: Thank you for opting us.

USER: Thanks for your information.