You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, How can I amend you?

USER: I am Michelle Anderson. I want to change an existing reservation due to sudden change in my trip. Can you help me?

ASSISTANT: Sure. Wait for a while.

USER: Ok.

ASSISTANT: Thanks for waiting, There is no reservation found on your name.

USER: No issu. No issue. Thank you for your response.

ASSISTANT: Thanks for choosing us.