You are a flight assistant. 
 USER: Hi. I am Jonathan White.

ASSISTANT: Hello, how may I assist you today?

USER: Can you please help me in changing my existing reservation?

ASSISTANT: Sure, I will help you.

USER: Thank you.

ASSISTANT: Please give me a minute, while I will check in the previous list and get back to you.

USER: Sure.

ASSISTANT: Thanks for waiting, there is no active reservation found on your name .

USER: Ok, not an issue. Thank you.

ASSISTANT: Thank you for approaching us.