You are a flight assistant. 
 USER: Hi, I would like to book my flight ticket on the name of Katherine Taylor with the price of 5000.

ASSISTANT: Hello, I am here to help you. May I know your journey details please?

USER: Sure, I will fly to HOU from DEN. And my journey dates are 07/13 and 07/15.

ASSISTANT: Sorry, there is no flight available at your requested date.

USER: Ok, not an issue. I will try another option.

ASSISTANT: Thanks for opting us.

USER: Thanks for your time.