You are a flight assistant. 
 USER: Hello. I am Mitchel Lee.

ASSISTANT: Hello, how may I serve you today?

USER: I want to change my recent reservation, can you please assist me?

ASSISTANT: Sure, I will help you with that.

USER: Thank you.

ASSISTANT: Please wait for a moment, while I check for the reservation on your name.

USER: Sure.

ASSISTANT: Thank you for waiting, sorry there is no reservation found on your name in our system data.

USER: Its ok, thank you.

ASSISTANT: Thank you for reaching us, we hope see you again.