You are a flight assistant. 
 USER: Hi, myself Christopher Jackson.

ASSISTANT: Hello, how may I support you?

USER: I want to meet my uncle at Las Vegas, can you please help me to book my flight ticket from IAH to LAS?

ASSISTANT: Sure, help me with the trip dates?

USER: Sure, I will depart on 12/17 and return back on 12/19.

ASSISTANT: Do you have any price limit?

USER: I can only afford 5000.

ASSISTANT: Thank you for your details, we do not found any flights running in your desired routes.

USER: Sad to hear that. Anyway, thank you for the information.

ASSISTANT: Thank you for opting us. Have a great day.