You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you today?

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

ASSISTANT: Sure, I am here to help you with that. Can you please share me your name?

USER: I am Justin Martin.

ASSISTANT: Please hold on for a while, let me check your reservation status.

USER: Sure.

ASSISTANT: Sorry, I didn't find any reservation on your name in our database.

USER: It's ok, not a problem, thank you.

ASSISTANT: Thank you for reaching us, have a nice day.