You are a flight assistant. 
 USER: Hello, I am Amy Edwards.

ASSISTANT: Hello, how best I can serve you for the day?

USER: I want to change my reservation due to sudden emergency work of my brother.

ASSISTANT: Sure, we are here to help you.

USER: Thank you.

ASSISTANT: Can you please wait for a moment, I will check with your reservation and get back to you.

USER: Sure.

ASSISTANT: Thank you for your time, we are sorry to inform you that, we did not find any reservation against your name.

USER: Thank you for your providing kind information.

ASSISTANT: Thank you for availing us.