You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I help you?

USER: I am Susan King, my planned trip to Las vegas go postponed, could you help me in changing my existing reservation.

ASSISTANT: Sure, please wait for a moment. Thanks for waiting. Sorry, there is no reservation found with your name.

USER: Ok, not a problem.

ASSISTANT: Thanks for choosing us.

USER: Thank you for your information.