You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: Myself Richard Young. I need to change my existing reservation, can you please help me?

ASSISTANT: Sure, I will help you with that changing.

USER: please proceed further.

ASSISTANT: Please wait for a while, let me check your previous reservation status.

USER: Take your time.

ASSISTANT: Sorry to say that, there is no reservation found under your name to change it. Thank you for contacting us.

USER: Thank you helping me with information provided.

ASSISTANT: Have a great day.