You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Amy Williams.

ASSISTANT: How can I assist you today?

USER: I need to amend my reservation as my schedule got postponed. Can you please help me about that?

ASSISTANT: Sure, will you please give me a moment?

USER: Thank you for considering my request.

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

USER: It's ok, anyway thank you for the information.

ASSISTANT: Welcome, have a great day.