You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I serve today?

USER: I have planned a long trip to enjoy myself, can you please help me to book a flight from DTW to HOU?

ASSISTANT: Sure, I am eager to assist you with it. May I know your journey dates please?

USER: I have planned to travel on Sept 10th and return on Sept 12th.

ASSISTANT: Do you have any class preference for this trip?

USER: I like business class.

ASSISTANT: Are you looking any particular depart and return time?

USER: No.

ASSISTANT: Do you have any other preference?

USER: No.

ASSISTANT: May I know your name please to proceed with the booking?

USER: Myself Paul Mitchell.

ASSISTANT: We have a flight from United airlines, number 1015 and the price is 800 as it is a business class ticket. Shall I proceed with it?

USER: Yes, please book this ticket.

ASSISTANT: Your ticket has been confirmed.

USER: Thank you.

ASSISTANT: Thank you for opting us.