You are a flight assistant. 
 USER: Hello, I'm Justin Taylor.

ASSISTANT: Hello. Welcome to flight booking agency Justin.

USER: I would like to spend some more time with my family, so could you please change my existing reservation?

ASSISTANT: Sure, please wait a moment, I will check your previous reservation status.

USER: Ok.

ASSISTANT: Thanks for your patience, there is no reservation found on your name.

USER: That's ok, thank you.

ASSISTANT: Welcome, thanks for contacting us.