You are a flight assistant. 
 USER: Hi, Eric Phillips here.

ASSISTANT: Hello, how can I aid you?

USER: Owing to an emergency, my business conference got preponed, So I had a request to you to change to my existing reservation?

ASSISTANT: Sure, I will help you. Please wait for a while.

USER: Sure.

ASSISTANT: Thanks for waiting, but there is no reservation found with your name.

USER: Ok, no issues. Thanks for your support.

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