You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I abet you?

USER: I am Steven Walker. I am planning to visit Museum of Nature and Science at Denver, could you please help me with booking a flight ticket?

ASSISTANT: Sure, may I know when are planning your trip?

USER: I would like to take off on 12/15 and return on 12/17.

ASSISTANT: Ok, how much should be the fare?

USER: My ticket fare should be less than 200.

ASSISTANT: Kindly share your airport codes to find a best flight for you.

USER: My nearest source airport code is ATL and destination airport code is DEN.

ASSISTANT: Ok, there is an Southwest airline available for you on your required dates of journey and the amount to be paid is 100. Shall I proceed?

USER: Please proceed with the booking if the connection is 1.

ASSISTANT: Your booking has been done with flight number 1009. Please be there 3 hours before your flight departs.

USER: I really appreciate your help, thank you for your service.

ASSISTANT: Thank you for choosing us.