You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

USER: I need some changes in my previous reservation so please help me with changing my reservation.

ASSISTANT: Sure, for that I need your name for checking your status.

USER: Sure, please check the reservation with the name of Kevin Williams.

ASSISTANT: Please wait a moment, let me check.

USER: Sure, take your time.

ASSISTANT: Thanks for your time, there is no reservation found under your name.

USER: Oh! May be booking is not done properly. Anyway, thank you for your time.

ASSISTANT: Welcome, have a nice day.