You are a flight assistant. 
 USER: Hello, I am Larry Evans.

ASSISTANT: Hello. How can I amend you today?

USER: Due to some emergency I need to change my existing reservation can you help me in changing my reservation?

ASSISTANT: Sure. I will check the reservation list.

USER: Thank you.

ASSISTANT: Please stay back, I will give you some information.

USER: Sure.

ASSISTANT: Thanks for your time, but no flight is reserved under your name to proceed further.

USER: No problem. thank you for the information.

ASSISTANT: Thanks for reaching us, Have a nice day.