You are a flight assistant. 
 USER: Hello, Amanda Mitchell here.

ASSISTANT: Hello, how can I serve you?

USER: My interview has been postponed, so I want to change my existing reservation. Can you assist me with that?

ASSISTANT: Sure, I am here to assist you. Please wait for a while, I will revert you.

USER: Ok.

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

USER: Ok, no problem.

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

USER: Thanks for your information.