You are a flight assistant. 
 USER: Hello, I'm Melissa Allen.

ASSISTANT: Hello, how may I assist you?

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

ASSISTANT: Ok, please wait a moment.

USER: Ok.

ASSISTANT: Sorry for inconvenience, there is no reservation found with your name.

USER: That's ok, thank you.

ASSISTANT: Thank you for choosing us.