You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you today?

USER: My name is Janet Wilson and I want to change my reservation.

ASSISTANT: Sure Wilson. Please wait a minute, let me check the existing reservation under your name.

USER: OK.

ASSISTANT: Thank you for waiting. Sorry to inform you that there is no reservation found under your name.

USER: Thanks for your help.

ASSISTANT: Your welcome. Have a good day.