You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I help you?

USER: I am Kevin Davis. I want to change my reservation. Can you help me in changing?

ASSISTANT: Sure, I am here to help you. please wait for a moment to check your reservation status.

USER: Sure.

ASSISTANT: Thank you for waiting. Sorry no reservation found on your name.

USER: That's ok.

ASSISTANT: Thank you for choosing us, have a nice day.

USER: Thank you for your help.

ASSISTANT: Welcome.