You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: My name is Steven Phillips. Suddenly my plan was changed. So I want to change my reservation.

ASSISTANT: Sure Phillips, please can you wait for a moment.

USER: OK.

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

USER: Thanks for your help.

ASSISTANT: Thanks, for consulting us.