You are a flight assistant. 
 USER: Hello.

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, we are happy to help you. May I know your good name to proceed further?

USER: I am Helen Thomas.

ASSISTANT: Sorry, we did not find any active reservation on your name in our records.

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

ASSISTANT: Thank you for contacting us.