You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: I am Andrew Williams, want to travel from SEA to LAS. Can you please help me in ticket booking?

ASSISTANT: Sure, may I know your trip dates please?

USER: My travel dates are from 07/05 to 07/07.

ASSISTANT: Sorry, we regret to inform you that there is no flight available as per your request.

USER: It's ok, thank you.

ASSISTANT: Most welcome.