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

ASSISTANT: Hello, how can I serve you today?

USER: Due to sudden change in my exam dates I need to Change my existing reservation can you help me with the changes?

ASSISTANT: Sure, please wait for a while.

USER: Thank you.

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

USER: No problem. Thank you for the information.

ASSISTANT: Thank you for availing us.