You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I aid you today?

USER: I am Susan King. I need to change my existing reservation, Can you please help me with that?

ASSISTANT: Just hold on a moment, let me check and get back to you.

USER: Sure.

ASSISTANT: There is no reservation found with your given name.

USER: Ok, no problem.

ASSISTANT: Thank you for choosing us.

USER: Thanks for your information.