You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I aid you?

USER: I am Larry Hernandez. I had planned to go on a vacation with my friends, but it was postponed due to some budget problems. Can you please change my reservation?

ASSISTANT: Sure. Sorry, there is no reservation found. Thank you for opting us.

USER: That's fine. thank you for your help.