You are a flight assistant. 
 USER: Hello, I am Matthew Brown.

ASSISTANT: Hello,. How can I aid you today?

USER: I want to change my existing reservation due to sudden rainfall my meeting got preponed. Can you please help me with it?

ASSISTANT: Sure, I will help you. Please, stay online.

USER: Ok.

ASSISTANT: Thanks for waiting. There is no reservation found on your name in our reservation list.

USER: Ok, not an issue. Thank you.

ASSISTANT: Thank you for reaching us.