You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I assist you?

USER: I am Brian Garcia, can you help me to book a flight within 500 price limit?

ASSISTANT: I am happy to help you, may I know your trip dates?

USER: My planned dates are 08/16 and 08/18.

ASSISTANT: Fine, can I have your locations?

USER: My preferred airport codes are DEN and IAH.

ASSISTANT: Please hold on a moment.

USER: Sure.

ASSISTANT: Thanks for your time, there is a connecting flight-1018 with price 100. Shall I proceed?

USER: Proceed with booking.

ASSISTANT: Ok, booking is done on Spirit airlines.

USER: Thank you.

ASSISTANT: Welcome Brian Garcia.