You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I amend you for the day?

USER: My name is Janet Turner. I want to change my existing reservation due to postpone of conference.

ASSISTANT: Ok, please wait I will check the reservation on your name and get back to you.

USER: Sure.

ASSISTANT: Sorry, there is no reservation found on your name.

USER: No issue, thank you for your service.

ASSISTANT: Thank you for reaching us.