You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I aid you?

USER: I want to change my reservation as my plan to visit New York to meet my brother is postponed. Can you change my reservation?

ASSISTANT: Sure, may I know your name?

USER: My name is Alexander Lee.

ASSISTANT: Give me a minute. Sorry, there is no reservation found under your name.

USER: Ok. Thank you for the information.

ASSISTANT: Thank you for reaching us.