You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: My name is Richard Wilson.

ASSISTANT: Hello Richard.

USER: As my business meeting is postponed, can you please help me with changing my existing reservation?

ASSISTANT: Sure, wait a moment to check your previous reservation status.

USER: Ok.

ASSISTANT: Sorry Richard, we don't found any reservation under your name.

USER: That's ok. Thank you for the information.

ASSISTANT: Thank you for approaching us.