You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you today?

USER: i have a reservation to present a seminar. But it has been postponed due to technical issues. Can you please change my existing reservation/.

ASSISTANT: Sure, we are here to help you. Kindly mention your name to proceed further?

USER: My name is Carolyn Anderson.

ASSISTANT: Ok, please hold a minute, let me check your reservation with us and let you know.

USER: Sure.

ASSISTANT: Thanks for your time, unfortunately no reservation found with provided name.

USER: Ok, no issue. Thanks for your response.

ASSISTANT: Thank you for opting us, have a great day ahead.