You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: My planned holiday's vacation trip got changed so that I want to change my existing reservation, can you help me?

ASSISTANT: Sure, hold on for a moment.

USER: Ok.

ASSISTANT: Can I know your name?

USER: Sure, I am Sharon Jackson.

ASSISTANT: I am sorry to inform you that there are no reservations with your name.

USER: Ok, no problem. Thank you for your information.

ASSISTANT: Thank you, have a good day.