You are a flight assistant. 
 USER: Hello,. I am Kathleen Evans.

ASSISTANT: Hello, how may I abet you today?

USER: I want to change my existing reservation as my dates of travel are postponed. Will you be my helping hand in changing my reservation?

ASSISTANT: Sure, please stand by.

USER: Sure.

ASSISTANT: Thank you for waiting. There is no reservation found on your name.

USER: Ok, no issues.

ASSISTANT: Thank you for opting us.

USER: Thank you for quick response.