You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I guide you today?

USER: My name is Gregory Perez, I want to change my reservation as my plan to visit Charlotte is postponed.

ASSISTANT: Sure, I am here to help you.

USER: Can you change my reservation?

ASSISTANT: Sure. Please give me a minute.

USER: Sure.

ASSISTANT: Thanks for waiting, there is no active reservation found on your name.

USER: Thank you for the information.

ASSISTANT: Thank you for visiting us.