You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

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

ASSISTANT: Sure, may I know your name please?

USER: My name is Timothy Hill.

ASSISTANT: I am sorry no reservation found on your name.

USER: That's ok. Thank you.

ASSISTANT: Thank you for choosing us.