You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I aid you?

USER: Can you please help me to change my existing reservation?

ASSISTANT: Sure, I am here to help you. May I know your name?

USER: I am James Williams.

ASSISTANT: There is no reservation found under your name.

USER: Ok, not an issue. Thank you for the information.

ASSISTANT: Thank you for opting us.