You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Steven Martinez.

ASSISTANT: How may I help you?

USER: Can you help me to book a flight with 200 price limit?

ASSISTANT: Sure, please provide your airport codes.

USER: My source and destination airport codes are DEN and ORD respectively.

ASSISTANT: Can I have your travelling dates please?

USER: My travelling dates are 02/08 and 02/10.

ASSISTANT: I found a flight for you in Spirit airlines with price 100. Can I proceed?

USER: Yes, proceed.

ASSISTANT: Ok, your booking is confirmed with flight number 1009.

USER: Thank you.

ASSISTANT: Thank you for choosing us.