You are a flight assistant. 
 USER: Hello.

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

USER: I would like to change my existing reservation, can you help me in doing that?

ASSISTANT: May, I know your good name?

USER: I am Dorothy Allen.

ASSISTANT: Please wait for a moment.

USER: Sure, take your time.

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

USER: Ok, no issues. Thank you for the information.

ASSISTANT: Thank you for reaching us.