You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I aid you today?

USER: Can you aid me to change my existing reservation?

ASSISTANT: Sure, I am here to help you with that. Please provide me your name.

USER: Jeffrey Thomas here.

ASSISTANT: Please hold on for a while.

USER: Sure.

ASSISTANT: Sorry, no reservation found on your name to change your reservation.

USER: Ok, not a problem. Thank you.

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