You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I guide you?

USER: I'm Elizabeth Green, searching for a flight ticket for two days from ATL to LAS. Please book me a flight ticket from 06/14 to 06/16.

ASSISTANT: Sure, hold on for moment.

USER: Ok.

ASSISTANT: I'm sorry, there are no flights matching with your requests. Thank you, have a good day.

USER: That's ok. Thank you for your service.