You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I aid you today?

USER: I am Samuel Adams, planning to change my existing reservation. Because I postponed my live concerts.

ASSISTANT: Sure, please hold for a moment.

USER: Ok.

ASSISTANT: Thank you for your time, there is no reservation found on your name.

USER: Ok. Thank you.

ASSISTANT: Thank you for opting us.