You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: Due to sudden change of my business meeting because of some technical problem, I need to change my reservation so can you help me with that?

ASSISTANT: Sure, may I know your name?

USER: I am Alexander Hernandez.

ASSISTANT: Sorry, no reservation found on your name.

USER: No problem, thank you for the information.

ASSISTANT: Thank you for opting us.