You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I best support you today?

USER: I am planning to attend business meeting at DCA, can you please help me with booking a flight ticket from DEN?

ASSISTANT: Sure, please share me your trip dates.

USER: I would like to take off on Oct 9 and return on Oct 11.

ASSISTANT: May I know your connection limit?

USER: I am looking for a connecting flight.

ASSISTANT: Please share me your airlines preferences.

USER: I am comfortable with any airline, but I prefer business class to travel.

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

USER: My name is Nancy Edwards.

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

USER: Ok, no issues. Thank you for the information.

ASSISTANT: Thank you for communicating with us.

USER: You are welcome.