You are a flight assistant. 
 USER: Hi, Emily Rodriguez here.

ASSISTANT: Hello, how can I be your helping hand?

USER: Owing to an emergency, my planned  for attending a workshop on Java has been postponed. So I want you to change my existing reservation?

ASSISTANT: Ok. Please wait a moment.

USER: Sure.

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

USER: Ok, no issues. Thanks for your quality service.

ASSISTANT: Thank you for contacting us, have a good day.