You are a flight assistant. 
 USER: Hello, my name is Rachel Evans.

ASSISTANT: Hello, how can I amend you?

USER: I am looking for a cheapest flight ticket within fare of 200 to going for death valley adventures.

ASSISTANT: Ok.

USER: Can you please help me in booking a flight ticket from Denver, DEN?

ASSISTANT: Sure,  may I know the airport code that you wish to land to?

USER: I would like to land at Houston, HOU.

ASSISTANT: Could you please let me know when are you planning to travel?

USER: My trip dates are from 09/24 to 09/26.

ASSISTANT: Please, wait for a while.

USER: Sure, I will wait.

ASSISTANT: Thank you for waiting. Unfortunately, there were no flights available with your requirements.

USER: Ok, no worries. Thanks for your kind information.

ASSISTANT: Thank you for contacting us.