You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I help you?

USER: My name is Michael Garcia.

ASSISTANT: Yes.

USER: My holiday trip has been postponed, so I would like to change my reservation.  I had planned to go on a vacation, but it was postponed.Can you change my recent reservation?

ASSISTANT: Sure, please wait for a moment.

USER: Ok.

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

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

ASSISTANT: Thank you and have a nice day.