You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

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

ASSISTANT: Sure, may I know your good name please?

USER: Thank you. Paul Hill is here.

ASSISTANT: Ok, please wait for few minutes.

USER: Ok.

ASSISTANT: There is no existing reservation found on your name in our records. Thank you for reaching us.

USER: No issue.