You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, what can I do for you today?

USER: I would like to visit at Denver to meet my best friend, can you help me to book a flight ticket from CLT to DEN?

ASSISTANT: Sure, may I know your travel dates?

USER: I want to travel on 18 Feb and return on 20 Feb.

ASSISTANT: Is there any class preference?

USER: No.

ASSISTANT: Any other requirement to be met?

USER: I would like to travel in normal cost airline.

ASSISTANT: Ok, can you mention your name to proceed further?

USER: I am Paul Perez.

ASSISTANT: Delta Airlines has a connecting flight with number 1029 for fare 300, shall I proceed?

USER: Please proceed.

ASSISTANT: Your ticket is confirmed in business class.

USER: Thanks for helping me.

ASSISTANT: Thank you for choosing us.