You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you?

USER: I would like to change my reservation as I am leaving for holiday trip, can you please help me out?

ASSISTANT: Can I know your name please?

USER: Betty Green here.

ASSISTANT: Please wait.

USER: Sure.

ASSISTANT: Sorry, no reservation found on your name to change. Thank you for reaching us.