You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

USER: I want to change my existing reservation due to some technical issues. Can you help me in doing that?

ASSISTANT: Sure, I can do that for you. Please be online for a while, let me check your reservation status in our database. May I know your name?

USER: I am Amanda King.

ASSISTANT: Sorry to inform you that there is no reservation found by your name in our database.

USER: Ok, not a problem. Thank you.

ASSISTANT: You are welcome and thank you for choosing us.