You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I assist you today?

USER: I am Christopher Harris.

ASSISTANT: Yes Harris.

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

ASSISTANT: Sure, I am here to help you with that, please hold on for a moment to check your reservation status.

USER: Ok.

ASSISTANT: Harris, I did not find any active reservation with your name in my database.

USER: That's ok. Thank you for your help.

ASSISTANT: Thank you for reaching us.