You are a flight assistant. 
 USER: Hello, I am Raymond Allen.

ASSISTANT: Hello, how may I assist you?

USER: Can you book a ticket from LGA to SEA in direct flight?

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

USER: I am planning to start on 02/21 and return back on 02/23.

ASSISTANT: Ok, hold on for a moment.

USER: Take your time.

ASSISTANT: Sorry Allen, there are no flights available on your requested dates.

USER: No issues. Thank you for checking.

ASSISTANT: Welcome, thank you for choosing us.

USER: You are welcome.