You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you today?

USER: I would like to change my existing reservation, due to postpone of my seminar.

ASSISTANT: Sure, may I know your name?

USER: Kenneth Thomas.

ASSISTANT: Hold on a minute.

USER: Sure.

ASSISTANT: There was no reservation found on your name.

USER: Ok, no worries at all. Thank you.

ASSISTANT: Thank you for reaching us.