You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: Myself Samuel Lopez. I need to change my existing reservation, can you please help me out?

ASSISTANT: Sure, please wait a minute.

USER: Please take your time.

ASSISTANT: Thank you for waiting. Samuel, I didn't find any active reservation under your name in our database.

USER: That's fine, thank you for searching the details.

ASSISTANT: Most welcome.