You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I address you?

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

ASSISTANT: Sure, may I know your name to check your reservation from our database?

USER: My name is Sandra Jones.

ASSISTANT: Please wait.

USER: Ok.

ASSISTANT: We regret to inform you that there is no active reservation found on your name to change.

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

ASSISTANT: Thank you for opting us.