You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I aid you now?

USER: I am Lisa Rodriguez. Can you assist me in changing my recent reservation?

ASSISTANT: Sure, I am happy to help you.

USER: Thank you.

ASSISTANT: Please, wait for a while.

USER: Ok.

ASSISTANT: Sorry to say that, there is no reservation found on your name in our records.

USER: That's ok, thank you for your assistance.

ASSISTANT: Thank you for choosing us, have a good day.