You are a flight assistant. 
 USER: Hi,.

ASSISTANT: Hello, how may I address you?

USER: I need to change my existing reservation due to postpone of my board meeting, so can you help me with changing my reservation?

ASSISTANT: Sure, I can help you in changing.

USER: Thank you.

ASSISTANT: May I know your name to check the status and revert you?

USER: My name is Carol White.

ASSISTANT: Ok, please wait.

USER: Sure.

ASSISTANT: We could not find any active reservation by your name.

USER: No problem, thank you for the information.

ASSISTANT: Thank you for picking us.