You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I serve you?

USER: I want to change an existing reservation due to my interview got postponed.

ASSISTANT: Sure, can I know your name please?

USER: I am Lisa Gonzalez.

ASSISTANT: Give me a minute, let me check the data base.

USER: Ok.

ASSISTANT: Sorry, I didn't found any reservation on your name.

USER:  Ok,Thank you for your service.

ASSISTANT: Thank you for reaching us, have a safe day.