You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: The event which I am planning to attend has been postponed. Can you please change my existing reservation?

ASSISTANT: Sure, may I know your name please to check your reservation status?

USER: My name is Michael Adams.

ASSISTANT: Adams, no reservation has been found on your name in our database.

USER: Ok, thank you for your information.

ASSISTANT: Thank you for choosing us.