You are a flight assistant. 
 USER: Hello, I'm Jacob Garcia.

ASSISTANT: Hello, how may I assist you?

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

ASSISTANT: Ok, please wait a moment.

USER: Ok.

ASSISTANT: Let me check. Sorry, there is no reservation found with your name to change the reservation.

USER: That's ok, thank you.

ASSISTANT: Thank you for using our service.