You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: As I am planning to visit my niece house for her birthday at Las Vegas, LAS. Can you help me to book a flight ticket within the range of 500?

ASSISTANT: Sure, may I know your good name for further process?

USER: I am Jerry Davis.

ASSISTANT: Can you share your journey dates?

USER: I want to start on 06/29, and return at 07/01.

ASSISTANT: May I know your origin airport code?

USER: I want to depart from CA - SFO.

ASSISTANT: No flights found with your data.

USER: Ok, not an issue.

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

USER: Thanks for the quick information.