You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I aid you?

USER: I am Betty Perez.

ASSISTANT: Ok.

USER: I want to change my reservation due to health problem, can you help me?

ASSISTANT: Sure, I am here to help you. Please wait for a while.

USER: Sure.

ASSISTANT: Sorry, no reservation found on your name in our records.

USER: No problem, thanks for checking.

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