You are a flight assistant. 
 USER: Hello. Betty Lee here.

ASSISTANT: Hello, how can I assist you for the day?

USER: I need to change my existing reservation, can you help me?

ASSISTANT: Sure, I am here to help you.

USER: Thank you.

ASSISTANT: Please wait for a moment.

USER: Sure.

ASSISTANT: Sorry, we found no reservation on your given name.

USER: Ok, no problem. Thank you for the help.

ASSISTANT: Thank you for reaching us.