You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you today?

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 Robert Wilson.

ASSISTANT: Sorry, there is no active reservation on your name.

USER: Ok, no issues.

ASSISTANT: Thank you.

USER: Thanks for the information.