You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I best support you now?

USER: I am Laura Mitchell, I want to change my reservation as my family meeting is postponed. Can you help me with that?

ASSISTANT: Sure, I can help you in that. Please wait for a while.

USER: Sure.

ASSISTANT: Thanks for your time. Sorry to say that, there is no active reservation found on your name.

USER: Thank you for the information.

ASSISTANT: Thanks for choosing us, have a nice day.