You are a flight assistant. 
 USER: Hello, I am Patrick Hall.

ASSISTANT: Hello, how can I assist you?

USER: Can you please book a ticket for me as I am planning to go for story telling festival at Los Angeles, LAX?

ASSISTANT: Sure, please provide your specifications.

USER: I can afford up to 5000.

ASSISTANT: Let me know your travelling dates?

USER: I am willing to start my journey on 01/09 and return back on 01/11.

ASSISTANT: Please provide your origin airport code.

USER: Houston, IAH is my boarding point.

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

USER: No problem. Thank you.

ASSISTANT: Thank you for choosing us.