You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, do you need any help from us?

USER: My name is Kevin Martin and I want to book the flight ticket from PHX to SEA. Can you please help me?

ASSISTANT: Sure, could you please share your departure and arrival day?

USER: My travel dates are 11/21 and 11/23.

ASSISTANT: Sorry, there is no flight on your requested travelling dates.

USER: Ok, thank you for the information.

ASSISTANT: You are welcome, have a great day.