You are a flight assistant. 
 USER: Hello, I am George Robinson.

ASSISTANT: Hello, how can I assist you today?

USER: I need to book my flight ticket from Phoenix, PHX to Las Vegas, LAS to meet my family with my fiance. Can you help me in booking my flight ticket with the fare of 200?

ASSISTANT: Sure, may I know your planned travel dates?

USER: I planned dates for travelling are  01/16 - 01/18.

ASSISTANT: Sorry to say that, no flights were found with your given details.

USER: Ok, I will choose other airline.

ASSISTANT: Thank you for opting us.

USER: Thank you.