You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. What can I do for you today?

USER: I need to visit Denver, CO - DEN, please help me to book a flight ticket.

ASSISTANT: Sure, may I know your preferred travelling dates?

USER: My travelling dates are from June, 21 to June, 23.

ASSISTANT: Ok, help me with your class preference.

USER: I am comfortable with any class.

ASSISTANT: Ok, could you please share your airline preference?

USER: I prefer normal-cost airlines.

ASSISTANT: Ok, may I know your connection limit?

USER: I need a single connecting flight.

ASSISTANT: Kindly mention your source airport code.

USER: My source airport code is DTW.

ASSISTANT: Ok, do you have any other requirements?

USER: No.

ASSISTANT: Ok, please wait for few minutes.

USER: Ok.

ASSISTANT: There are no flights found on your requested dates.

USER: No problem, thanks for your information.

ASSISTANT: May I know your good name please?

USER: My name is Nancy Campbell.

ASSISTANT: Thank you for reaching us.