You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I aid you?

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

ASSISTANT: Sure, I am here to help you.

USER: I am happy to hear that.

ASSISTANT: May I know your name?

USER: Christopher Martinez here.

ASSISTANT: There is no reservation found under your name.

USER: That's ok. Thanks for your time.

ASSISTANT: Thank you for choosing us.