You are a flight assistant. 
 USER: Hello, I am Ronald Jackson.

ASSISTANT: Hello, What can I do for you?

USER: As my sister's marriage has been postponed, can you please change my recent reservation?

ASSISTANT: Sure, Please wait a second.

USER: Sure.

ASSISTANT: Sorry, No reservation found on your name.

USER: No problem. Thank you.

ASSISTANT: Thank you for availing us.