You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Ryan Taylor.

ASSISTANT: How can I help you Taylor?

USER: I want to change my reservation, can you help in booking?

ASSISTANT: Sure Ryan Taylor, please wait a moment. Sorry, there is no reservation found on your name.

USER: That's ok.

ASSISTANT: Thank you for approaching us.

USER: Thank you for your help.

ASSISTANT: You are welcome.