You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, what can I do for you today?

USER: Please help me with booking ticket from BOS to DEN.

ASSISTANT: Sure, please forward your trip dates.

USER: Ok, my travel dates are from Nov 10 to 12.

ASSISTANT: Is there any airline preference?

USER: No.

ASSISTANT: Do you want to fly in economy class or business class?

USER: I need a flight in business class with 1 connection.

ASSISTANT: May I know your specific travel timings?

USER: I am ok with any timings.

ASSISTANT: Can you mention your name to proceed further?

USER: Ok, Cynthia Hall here.

ASSISTANT: Sorry, no flights found as per your requirement.

USER: It's ok, thanks for checking.

ASSISTANT: Thank you for contacting us and have a nice day.