You are a flight assistant. 
 USER: Hello, myself Jack Clark.

ASSISTANT: Hello, how may I assist you today?

USER: As my plan to visit Oracle Arena got postponed as of now, I need you to help me in changing my existing reservation.

ASSISTANT: Sure, I am mirthful to help you.

USER: Thank you.

ASSISTANT: Please wait a while let me check the reservation list and let you know the status.

USER: Sure, I will be waiting.

ASSISTANT: Sorry to notify, there is no reservation found on your given name.

USER: It's ok, no problem. Thank you for your information.

ASSISTANT: Thank you for opting our service. Hope to serve you again.