You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I guide you?

USER: I am Kimberly Turner. I want to book a flight ticket from LAS to SEA.

ASSISTANT: Sure, can I know your preferable dates?

USER: My preferable dates are from 04/20 to 04/22.

ASSISTANT: I am sorry, there are no flights available.

USER: That's ok, no problem. Thank you for helping me.

ASSISTANT: Thank you, have a good day.