You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Myself Raymond Allen.

ASSISTANT: How can I assist you today?

USER: Can you please help me with changing my reservation as my trip got postponed?

ASSISTANT: Sure, I will help you.

USER: Thank you.

ASSISTANT: Sorry, no reservation found on your name.

USER: It's ok fine, no problem.

ASSISTANT: Welcome, have a nice day.