You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. What can I do for you at this moment?

USER: Please help me in changing of my existing reservation.

ASSISTANT: Sure, may I know your good name please?

USER: Catherine Wright.

ASSISTANT: There is no existing reservation found on your name in our records.

USER: Ok, no problem. Thank you.

ASSISTANT: Thank you for reaching us.