You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: I am Melissa Hall, I want to change my reservation as my plan for vacation at New York is postponed. Can you change my reservation?

ASSISTANT: Sure, we are here to help you. wait for a while.

USER: Sure.

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

USER: Ok, thank you for the details.

ASSISTANT: Thanks for approaching us.