You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Myself Donna Scott.

ASSISTANT: How may I assist you?

USER: I would like to change my existing reservation because my seminar was extended, so can you help me?

ASSISTANT: Sure. Please wait for a minute to check.

USER: Ok.

ASSISTANT: Sorry. There is no reservation on your name.

USER: No issues.

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

USER: Thank you for your services.