You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: I am planning to attend music concert at DCA, can you please help me with booking a flight ticket from LAS?

ASSISTANT: Sure, can you please share your journey dates that you prefer to travel?

USER: I would like to take off on Nov 26 and return on Nov 28.

ASSISTANT: Do you require any stopovers in your journey?

USER: Yes, I am looking for a connecting flight.

ASSISTANT: Is there any other preferences that you would like to add before booking?

USER: I prefer business class.

ASSISTANT: To proceed further, can I know your name please?

USER: My name is Michelle Parker.

ASSISTANT: Thank you for providing your journey details, please wait a moment I'll search best flight for you.

USER: Sure, take your time.

ASSISTANT: Thank you for being patient, we didn't find any flights which matches your requirement.

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

ASSISTANT: Thank you for reaching us, have a nice day.

USER: You are welcome.