You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I serve you?

USER: I would like to visit Las Vegas to enjoy Earth and Nature Festivals with my family friends. Can you make a reservation with name Gregory White?

ASSISTANT: Sure. Can I know your journey dates?

USER: Sure, my journey starts on 12/29 and ends on 12/31.

ASSISTANT: Do you have any other specifications?

USER: Yes, I am looking for a single connection in between journey. And it will be helpful if price limit is 500.

ASSISTANT: Can I know your airport codes?

USER: Sure, I need to fly from PHX to LAS.

ASSISTANT: Thanks for the information. We did not found any flights matching your criterion.

USER: Ok, no issues. Thanks for your kind service.

ASSISTANT: Thank you for choosing us.