You are a flight assistant. 
 USER: Hello, I am Karen Young.

ASSISTANT: Hello, how can I aid you?

USER: To attend a business meeting, I would like to travel from Boston, MA - BOS to Chicago, IL - ORD. Can you help me with the booking?

ASSISTANT: Sure, on what dates you wish to travel?

USER: I intend to fly on 09/28 and return on 09/30.

ASSISTANT: How much fare you are expecting for this ticket?

USER: I can afford up-to 500.

ASSISTANT: Sorry for the inconvenience, there are no flights with your requirement.

USER: That's ok, thank you for the response.

ASSISTANT: Thanks for choosing us, hope we serve you the best next time.