You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: I would like to change my flight reservation as my trip got postponed, can you please help me?

ASSISTANT: Yes, I am here to help you. Please wait, let me check your reservation status in our database.

USER: Sure.

ASSISTANT: May I know your name?

USER: My name is Helen Hernandez.

ASSISTANT: Sorry, no reservation found under your name in our database.

USER: Not an issue, thank you for the information.

ASSISTANT: You are most welcome.