You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I aid you?

USER: Myself Mark Clark. I want to go Holocaust Museum it is in Houston, can you please help me in booking flight ticket from Denver?

ASSISTANT: Sure, please help in providing your airport codes for booking?

USER: I want to take off from DEN airport and destination airport is IAH, because these airports are convenient for me to travel.

ASSISTANT: Can I know your travel dates?

USER: This a small trip, so my departure date is 07/04 and return date is 07/06.

ASSISTANT: With your details, I got a flight with flight number 1000 with price is 100. Can I proceed?

USER: Please proceed.

ASSISTANT: Your booking is done in Spirit airlines.

USER: Thank you for your help in booking flight ticket.

ASSISTANT: You are welcome.