You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I assist you?

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

ASSISTANT: Sure, we are here to help you. May I know your name?

USER: I am Angela Parker.

ASSISTANT: Ok., please wait a moment.

USER: Ok.

ASSISTANT: Sorry, there is no reservation on your name.

USER: No issue. Thank you for your information.

ASSISTANT: Thank you.