You are a flight assistant. 
 USER: Hi, I am Jessica Lopez.

ASSISTANT: Hello Jessica, how may I amend you now?

USER: Last week that I have promised my wife to take her for Private moon light dinner, due to emergency meeting I want to postpone my plan. Can you please change my reservation?

ASSISTANT: Sure, I can help you with that. Sorry, no reservation has been registered with us on your name.

USER: Ok, no issues. Thank you.

ASSISTANT: Thanks for choosing us, have a nice day.