You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: I am George Williams.

ASSISTANT: How are you doing George?

USER: My business meeting is postponed, so I need your help me to change my existing recent reservation. Can you help me?

ASSISTANT: Sure, I am here to help you. Please wait for a moment.

USER: Ok.

ASSISTANT: Sorry, there is no previous reservation found on your name to change.

USER: It's ok. Thank you for your information.

ASSISTANT: Thank you for contacting us.