You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Nicholas Hall.

ASSISTANT: How can I aid you?

USER: Would it be possible to change my reservation?

ASSISTANT: Sure, I will help you with that.

USER: Thank you.

ASSISTANT: Nicholas Hall, we haven't found any reservation under your name in our database.

USER: It's ok, thanks for your information and service.

ASSISTANT: Thank you for reaching us.