You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, may I know your name please?

USER: I am Karen Evans.

ASSISTANT: How can I provide assistance to you?

USER: I would like to go from Denver to Francisco with the price of 500, can you please book me a ticket?

ASSISTANT: Sure, please provide me your travelling dates?

USER: My travelling dates are from 09/22 to 09/24.

ASSISTANT: Can you share me your airport codes?

USER: My preferable airport codes are from DEN to SFO.

ASSISTANT: Do you need any connection between the journey?

USER: Yes, I need one connection limit.

ASSISTANT: There is a direct flight with Delta airline.

USER: Ok, don't proceed for booking.

ASSISTANT: Ok, thanks for opting us.

USER: Thank you so much.