You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: I want to book a flight ticket from DEN to IAD. Could you help me in booking?

ASSISTANT: Sure, when do you want to travel?

USER: My travelling dates are from June 27 - 29.

ASSISTANT: Ok, Do you have any class preference?

USER: No.

ASSISTANT: Ok, Kindly mention your connection limit.

USER: I prefer for connecting flight.

ASSISTANT: Ok, May I know your name?

USER: Edward Evans.

ASSISTANT: Ok, Do you have any other preferences?

USER: No.

ASSISTANT: Ok, please wait for a while.

USER: Ok.

ASSISTANT: Thank you for your time, No flights were found with your given details.

USER: That's ok, thank you.

ASSISTANT: Thank you for reaching us.