You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello, how can I serve you today?

USER: I want to change my existing reservation due to my business meeting place has been changed. Can you help out with this?

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

USER: I am Nancy Parker.

ASSISTANT: Ok, please wait a minute.

USER: Sure.

ASSISTANT: Thank you for your time. Unfortunately there is no reservation found according to your name.

USER: Ok, thank you.

ASSISTANT: Thank you for choosing us.