You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: I am Emma Thompson, want to travel from LAS to DTW.

ASSISTANT: Sure, may I know your trip dates?

USER: My trip dates are from 02/14 to 02/16.

ASSISTANT: Sorry Emma, there is no flight available as per your request.

USER: Thank you.

ASSISTANT: Most welcome.