You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I oblige you today?

USER: Can you please book a flight ticket from CLT to DTW?

ASSISTANT: Sure, could I have your travel dates, please?

USER: My trip is in Sept from 15th to 17th.

ASSISTANT: May I know your good name?

USER: Mark Jones here.

ASSISTANT: Do you have any preferences?

USER: I need a connecting flight.

ASSISTANT: Ok, please wait for a while.

USER: I prefer to travel in business class. Sure, take your time.

ASSISTANT: Sorry, there are no flights available as per your requirements.

USER: That's ok, thank you for the information.

ASSISTANT: Thank you for opting us.