You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: My name is Virginia Thomas. I would like to change my reservation, could you help me out?

ASSISTANT: Sure, I will help you to change your reservation.

USER: Ok.

ASSISTANT: Please give me a moment.

USER: Ok.

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

USER: That's ok.

ASSISTANT: Thank you for choosing us.

USER: Thank you for your time.