You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Jack Young.

ASSISTANT: How can I aid you?

USER: I am planning to do my birthday shopping in 16th street mall on 5th of Feb. So, can you please help me in reserving a flight ticket to DEN?

ASSISTANT: Sure, I can help you with that. May I know your source airport code please?

USER: I would like to board from ATL.

ASSISTANT: Can you please provide your planned travel dates?

USER: After completion of shopping, I will return on 7th of Feb.

ASSISTANT: Fine, do you have any other specifications?

USER: Yes, I need a flight in business class.

ASSISTANT: Ok, please wait for a while.

USER: Sure.

ASSISTANT: Southwest airlines is having a flight on that route with ticket fare of 700, shall I proceed for booking?

USER: No, do not proceed. I can afford only 500.

ASSISTANT: Fine, let me check for the flights which is having tickets under your budget.

USER: Ok.

ASSISTANT: Sorry to inform you that there are no flights available for you on those dates within your budget.

USER: It's ok, thank you for your kind information.

ASSISTANT: Thank you for reaching us, have a great day.