You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. May I know your name, Please?

USER: Larry Lopez is my name.

ASSISTANT: How may I help you for the day?

USER: My friend is not feeling good, so I need to change my existing reservation.

ASSISTANT: Sure. There is no reservation found on Larry Lopez.

USER: Ok, no problem. Thanks for your information.

ASSISTANT: We thank you for having a discussion about the ticket reservation with us.