You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I assist you?

USER: Please book a flight ticket from IAH to SFO locations.

ASSISTANT: Sure, may I know your name please?

USER: Yes, myself James Nelson.

ASSISTANT: James, please tell me the travelling dates of your journey?

USER: I want to travel from 11/29 to 12/01 dates.

ASSISTANT: Please wait for a moment. Thank you for waiting James, there is a flight 1007 in Spirit airline has the price 900. Shall I proceed with this booking?

USER: My budget is just 500, do not proceed the booking.

ASSISTANT: Sorry for the inconvenience.

USER: Thank you for the information.

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