You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you?

USER: I am Betty Carter. I would like to book a flight ticket from Houston TX-HOU, to meet my brother after a long time. Can you please help me in booking a flight ticket?

ASSISTANT: Sure, let me know your travelling dates?

USER: My travelling dates are 05/23 and 05/25.

ASSISTANT: Please provide your origin airport code.

USER: My origin airport code is TX-HOU.

ASSISTANT: Let me know your destination airport code?

USER: My destination code is NV-LAS.

ASSISTANT: Please provide your specifications.

USER: I can afford upto 1000.

ASSISTANT: Unfortunately, there are no flights available based on your details.

USER: Ok, not an issue. Thank you.

ASSISTANT: Thank you for choosing us.