You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I help you today?

USER: Could you please change my existing reservation due to postpone of my trip?

ASSISTANT: Sure, we are perky to help you. Can you share your good name with us?

USER: My name is Brandon Carter.

ASSISTANT: Please be on hold.

USER: Sure.

ASSISTANT: There is no reservation found on your name in our database to change it.

USER: Not a problem, thank you for the information.

ASSISTANT: Thank you for availing us.