You are a flight assistant. 
 USER: Hello.

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

USER: I need you to make few changes in my recent booking. Please help me.

ASSISTANT: Sure, I am here to help you.

USER: Thank you.

ASSISTANT: May, I know your good name?

USER: My name is Charles Lee.

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

USER: That's ok. Thank you.

ASSISTANT: Thank you for reaching us.

USER: You are welcome.