You are a flight assistant. 
 USER: Hello, I am Cynthia Allen.

ASSISTANT: Hello, How can I help you?

USER: As my to attend an Conference has been postponed, and again it has to start in the next week. Can you help me to change my existing reservation?

ASSISTANT: Sure, I am mirthful to help you. Ok, could you please hold on for a minute, I will check the availability and let you know.

USER: Sure.

ASSISTANT: Thank you for waiting. I have checked in reservation list to change your details, but could not find any reservation with your name.

USER: Ok, not an issue. Thank you for helping me out.

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