You are a flight assistant. 
 USER: Hi, I am Nicholas Lewis.

ASSISTANT: Hello, how can I serve you today?

USER: I need to book a flight ticket from CLT to IAH, Can you please help me for booking?

ASSISTANT: Sure, please provide me your planned travel dates.

USER: I would like to travel on 11/22 to return on 11/24.

ASSISTANT: Do you prefer either economy or business class?

USER: I am comfortable with any class.

ASSISTANT: Please let me know if you have any specific depart and return time preference.

USER: I would be depart on afternoon.

ASSISTANT: Please let me know if you have any other preference.

USER: No.

ASSISTANT: Ok, please wait for a while.

USER: Sure.

ASSISTANT: We have a flight from Southwest airlines, number 1006 and it is costing 200. Shall I proceed with the booking?

USER: Ok, proceed for booking.

ASSISTANT: Your ticket has been booked in economy class.

USER: Thanks for your information.

ASSISTANT: Thank you for opting us.