You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you?

USER: I want to book a flight ticket from BOS to DFW. Can you make reservation for me?

ASSISTANT: Sure, please share your trip dates.

USER: Ok, my planned trip dates are on July 27 and return on July 29.

ASSISTANT: Which class do you prefer?

USER: Ok, I need a direct flight.

ASSISTANT: May I know your name?

USER: Ok, I am Steven Baker.

ASSISTANT: Sorry Steven Baker, no flights are available on your route.

USER: Ok, not a problem. Thank you for your help.

ASSISTANT: Thank you for reaching us.