You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I be at your service?

USER: I would like to book a flight ticket from IAD to DEN to meet my friend. Could you please help me with booking a flight ticket?

ASSISTANT: Sure, I am here to help you with the booking. May I know your departure and return dates please?

USER: My travelling dates are Jan 12 and Jan 14.

ASSISTANT: Do you prefer either economy or business class?

USER:  I need a economy class.

ASSISTANT: May I know your connection limit?

USER: I prefer a break in between the journey.

ASSISTANT: Do you have any other preference?

USER: No, I do not have any preferences.

ASSISTANT: We have a flight from United airlines, number 1014 and the fare for this is 100. Shall I proceed with the booking?

USER: Proceed with booking on name Alexander Lopez.

ASSISTANT: Sure, your ticket has been confirmed in economy class.

USER: Thank you for your help.

ASSISTANT: Thank you for choosing us.