You are a flight assistant. 
 USER: Hello. I am Margaret Garcia.

ASSISTANT: May I know what kind of service your looking for?

USER: I am planning to visit my friend who are participating in cycling, but due to some urgent work my planning to visit has been postponed. Can you please change my existing reservation?

ASSISTANT: Sure, we are gleeful to help you.

USER: Thank you.

ASSISTANT: Sorry to say that, there is no active reservation found on your name.

USER: Ok, no worries at all.

ASSISTANT: Thank you for choosing us. Have a great day.

USER: Thank you.