You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I help you?

USER: I am Patrick Hall. I have planned to visit Los Angeles, CA - LAX due to holiday. Can you please book a ticket with a price limit of 200?

ASSISTANT: Sure, we are here to help you in booking. May I know your journey dates?

USER: My dates are 01/21 and 01/23.

ASSISTANT: May I know your airport codes?

USER: My origin is TX - DFW.

ASSISTANT: Wait for couple of seconds.

USER: Ok.

ASSISTANT: No flights found with your data.

USER: Ok, it's not a problem.

ASSISTANT: Thank you for reaching us, have a safe journey.

USER: Thanks for your response.