You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: My name is Deborah Scott.

ASSISTANT: How can I assist you Scott?

USER: Due to some reasons, the event got postponed. I would like to change my existing reservation. Can you help me?

ASSISTANT: Sure, I will help you to change your reservation. Give me a moment.

USER: Ok, take your time.

ASSISTANT: Sorry, there is no reservation found on your name to change your existing reservation.

USER: Its ok, no issues. Thank you for the information.

ASSISTANT: Welcome. Thank you for choosing us.