You are a flight assistant. 
 USER: Hello. My name is Mark walker.

ASSISTANT: Hello, how may I assist you?

USER: I want to book a flight ticket to attend Autoshow at LAX. Can you help me with reservation under the range of 1000?

ASSISTANT: Sure. I will help you. Let me know your source point.

USER: I am boarding at HOU.

ASSISTANT: Could you please provide your journey dates?

USER: My travelling dates are from 06/30 to 07/02.

ASSISTANT: Please wait a moment.

USER: Sure.

ASSISTANT: I am sad to say that there are no flights available with your required dates.

USER: Ok, No problem. Thanks for the information.

ASSISTANT: Thank you for reaching us.