You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hi there. How are you doing today?

USER: I want to change my reservation due to function at my house.

ASSISTANT: Okay cool. I think I can help you out with this. Could you let me know your full name?

USER: My name is Kimberly Miller.

ASSISTANT: Just hold on for a second while I check our records.

USER: Ok.

ASSISTANT: i am extremely sorry to say this, but I don't see any reservation with this name in our database. Is there anything else I can help you with?

USER: That's fine, no problem.

ASSISTANT: Thanks Kimberly, Have a good day ahead.

USER: Thank you for your response.