You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you for the day?

USER: I am Paul Scott.

ASSISTANT: Ok.

USER: I am planning to celebrate the traditional festival with my parents in Las Vegas NV-LAS, can you please assist me in booking?

ASSISTANT: Sure, I am here to help you.

USER: Thank you.

ASSISTANT: When you are willing to travel?

USER: I am willing to travel on 02/28 and return on 03/01.

ASSISTANT: Can you help me with your source code?

USER: My source code is PA-PHL.

ASSISTANT: Please wait for a moment. Sorry, we found no flights on your given dates.

USER: Sure. Ok, not an issue. Thank you for your information.

ASSISTANT: Thank you for reaching us.