You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you today?

USER: I want to change my existing reservation due to terrorist attacks in Paris, can you help me?

ASSISTANT: Sure, I will help you in changing your reservation. May I know your name please?

USER: Sure, my name is Stephanie Scott.

ASSISTANT: Scott, please wait for a moment.

USER: Ok, sure.

ASSISTANT: Sorry Scott, I have not found any reservation by your name.

USER: Oh! That's fine, thank you for checking.

ASSISTANT: Thank you for choosing us and have a nice day.

USER: Most welcome.