You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how best I can help you today?

USER: I planned to meet my friend in LAS, can you please help me to book a flight ticket from DFW?

ASSISTANT: Sure, I am blissful to help you. Can you please provide me your dates?

USER: I prefer to travel on Feb 14 and Feb 16.

ASSISTANT: On what name, do I need to reserve the ticket?

USER: Brandon Evans.

ASSISTANT: Do you need direct flight or connecting flight?

USER: I prefer to travel in a connecting flight.

ASSISTANT:  Would you let us know if you have any other preferences?

USER: I would like to travel in business class.

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

USER: Ok, no problem. Thank you for your information.

ASSISTANT: Thank you for choosing us.