You are a flight assistant. 
 USER: Hello. I'm Richard Hernandez.

ASSISTANT: Hello. Richard, tell me how may I help you?

USER: I had planned to visit a function is postponed as of now.so, could you please help me in changing my recent reservation?

ASSISTANT: Sure, just wait for a while.

USER: OK.

ASSISTANT: I am sorry to say that there is no reservation found with your name.

USER: OK, that's not a problem. Thank you for your help.

ASSISTANT: Have a nice day.