You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I aid you?

USER: My business trip has been postponed, can you please help me for changing the existing reservation?

ASSISTANT: Sure, give me a minute.

USER: Sure.

ASSISTANT: May I know your name before checking.

USER: My name is Lisa White.

ASSISTANT: Sorry, there is no reservation found under your name.

USER: Ok, no problem. Thank you for your information.

ASSISTANT: Thank you for opting us.