You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: I have an important work at New York, please help me in booking a ticket.

ASSISTANT: Sure, I am here to help.

USER: Thank you.

ASSISTANT: Can you provide me your trip dates?

USER: Sure, my trip dates are 12/18 and 12/20.

ASSISTANT: May I know your location airport codes?

USER: My origin and destination airport codes are PHX and LGA.

ASSISTANT: Could you provide me your name please?

USER: My name is Patricia Thompson.

ASSISTANT: Sorry Thompson, there is no flights in your route.

USER: Ok, no problem. Thank you for your information.

ASSISTANT: Thank you for reaching us.