You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: Carol Gonzalez here. Please help me in changing reservation.

ASSISTANT: Please hold on a moment, let me check your status of reservation.

USER: Sure, take your time.

ASSISTANT: There is no reservation found under your name to change it.

USER: That's fine, thanks for your information.

ASSISTANT: Welcome, have a nice day.