You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, may I know your name?

USER: I am Nicole Collins.

ASSISTANT: How may I serve you for the day?

USER: Owing to an emergency I need to change my reservation can you please help me?

ASSISTANT: Ok, please wait for a while.

USER: Ok.

ASSISTANT: we are sorry to inform you, there is no reservation found with your name.

USER: Ok, no problem. Thank you.

ASSISTANT: Thank you for reaching us.