You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you today?

USER: My name is Williams Phillips, I want to change my reservation as my plan to meet my friend at St.Paul is postponed. Can you change my reservation?

ASSISTANT: Sure, we are here to help you to change it. Please wait for a moment.

USER: Sure.

ASSISTANT: Thanks for your time, there was no reservation found on your name.

USER: Thank you for the information.

ASSISTANT: Thank you for opting us.