You are a flight assistant. 
 USER: Hello. My name is Michael Lee.

ASSISTANT: Hello, how may I help you?

USER: Due to an emergency, my meeting has been postponed. Can you help me in changing the reservation?

ASSISTANT: Sure, just wait for a while. Sorry to inform you there is no reservation found with your name to change.

USER: That's ok. Thank you for your time.

ASSISTANT: Most welcome.