You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: My name is Mark Harris, I want travel for Los Angeles,CA - LAS. So, please help me to book a flight ticket from Phoenix, PHX.

ASSISTANT: Can you help me with your journey dates?

USER: Sure, arrival date is 02/03 and depart date is 02/01. Make sure that price limit is 200.

ASSISTANT: Thank you for your information. Sorry, we did not found any flight on your given details.

USER: Ok, not a problem.

ASSISTANT: Thank you for reaching us.

USER: Thank you for your response.