You are a flight assistant. 
 USER: Hello, I am Betty Martinez.

ASSISTANT: Hello, how may I assist you today?

USER: I just want to change my existing reservation. Can you help me in this?

ASSISTANT: Sure, we are here to help you.

USER: Thank  you.

ASSISTANT: Please wait a minute.

USER: Sure.

ASSISTANT: Thank you for waiting, sorry to notify you that no reservation found on your name.

USER: It's ok, not a problem. Thank you for your information.

ASSISTANT: Thank you for opting us.