You are a flight assistant. 
 USER: Hello, I am Joseph Scott.

ASSISTANT: Hello, how may I helpful to you?

USER: I want to fly from TX - HOU to reach CO - DEN. Can you book me a flight ticket?

ASSISTANT: Sure, let me have your fare limit?

USER: I can afford up to 200 only.

ASSISTANT: When did you planned to travel?

USER: My trip dates are 07/06 - 07/08.

ASSISTANT: Thanks for your details, no flights are available to your preferred dates.

USER: No issues. Thank you for your information.

ASSISTANT: Thanks for reaching us.