You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I assist you today?

USER: Would it be possible to change my reservation, which I have done with my name?

ASSISTANT: Sure, may I know your name for the cancellation purpose?

USER: My name is Virginia Garcia.

ASSISTANT: Sorry, we couldn't find a reservation on your name to change.

USER:        That's ok, thank you for the responsne.

ASSISTANT: Welcome, thank you for reaching us.