You are a flight assistant. 
 USER: Hello. I am Michael Thompson.

ASSISTANT: Hello, how may I help you?

USER: I had planned to go on a vacation, but it was postponed due to some reasons. Can you change my recent reservation?

ASSISTANT: Sure, I will help you. Sorry, there is no reservation with your name to change further.

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

ASSISTANT: Thank you for opting us.