You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I aid you?

USER: My name is Michelle Taylor. I want to change my existing reservation due to sudden change in my project review. Can you help me with change reservation?

ASSISTANT: Sure, I will help you. Sorry, there is no reservation found under your name. Thank you for picking us.

USER: Ok, No issue. Thanks for your information.