You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: I want to do some change in my existing reservation, can you please help me for that?

ASSISTANT: Sure, I will help you out. Please provide me your name to check your previous reservation on your name.

USER: Thank you, my name is Scot Martinez.

ASSISTANT: Please wait a moment.

USER: Sure, you can take your own time.

ASSISTANT: Sorry Scot, no reservation found on your name.

USER: That's ok, thank you for checking.

ASSISTANT: Thank you for reaching us.

USER: Welcome.