You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I aid you?

USER: Due to sudden work, so I want to change my existing reservation. Can you please help me with it?

ASSISTANT: Sure, may I know your name?

USER: Carol Moore here.

ASSISTANT: Give me a minute for checking.

USER: Ok.

ASSISTANT: Sorry, there is no reservation found under your name.

USER: Ok, not an issue. Thank you.

ASSISTANT: Thank you for reaching us.