You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you today?

USER: My name is Joseph Perez, I want to change my reservation as my plan to visit my home is postponed. Can you change my reservation?

ASSISTANT: Sure, please wait for a couple of minutes.

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 choosing us.