You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I assist 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, I can help you. May I know your name?

USER: I am Robert Nelson.

ASSISTANT: Sorry Robert Nelson, no reservation is available by your name.

USER: Ok, no issues. Thanks for the information.

ASSISTANT: Thank you for choosing us.