You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: My name is Karen Garcia.

ASSISTANT: How can I assist you Karen?

USER: I am searching to book a plane ticket to MSP from PHX, can you please reserve me a seat?

ASSISTANT: Could you please provide your journey dates?

USER: My travelling dates are from 06/05 to 06/07. I need nonstop flight.

ASSISTANT: Please wait, let me check the best flight for you.

USER: Ok.

ASSISTANT: Sorry Karen, no flight is available for you on your route MSP to PHX.

USER: It's ok, thank you.

ASSISTANT: Thank you for choosing us.