You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: I have re-planned my journey. So please help me by making few changes in my previous booking.

ASSISTANT: Sure, please share your good name?

USER: It's Kevin Clark.

ASSISTANT: Please wait for a while.

USER: Sure.

ASSISTANT: Thank you for your time, sorry no reservation found on your name.

USER: That's ok. Thank you.

ASSISTANT: Thank you for choosing us.