You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I aid you?

USER: Please help me to change my recent reservation.

ASSISTANT: Sure, I can help you. Can I know your name?

USER: Thank you. I am Carol Davis.

ASSISTANT: Give me a minute.

USER: Ok.

ASSISTANT:  Sorry, we couldn't find a reservation on your name to change.

USER: No problem, thanks for your information.

ASSISTANT: Thank you for reaching us.