You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

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

ASSISTANT: Yes, I will try to help you. Please help me with your name.

USER: Sure,Jennifer Mitchell here.

ASSISTANT: Please allow me a minute.

USER: Sure.

ASSISTANT: Jennifer Mitchell, I am really sorry to inform you that there is no booking details found on your name.

USER: No issues, thank you for the information.

ASSISTANT: Thank you for reaching us. Have a great time.