You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you today from my end?

USER: I planned to attend for a meeting in DFW, can you please help me to book a flight ticket from DEN?

ASSISTANT: Sure, I am here to help you out. Please provide me your trip dates.

USER: I prefer to travel on Nov 1 and Nov 3.

ASSISTANT: May I know your name to proceed further?

USER: I am William Roberts.

ASSISTANT: Is there any requirement?

USER: I prefer to travel in a connecting flight.

ASSISTANT: May I know your class preferance?

USER: I am comfortable with all class.

ASSISTANT: Sorry William Roberts, there is no flight in your route as per your requirement.

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

ASSISTANT: Thank you for reaching us.