You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I assist you at this moment?

USER: Can you help me to change my reservation?

ASSISTANT: Sure, I will help you in changing, can you please hold on for a moment to check your reservation status. May I know your name please?

USER: My name is Christopher Carter.

ASSISTANT: Carter, there is no any active reservation with your name in my database.

USER: Ok, no issues. Thank you for your help.

ASSISTANT: You are welcome.