You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: Could you help me out to change my reservation?

ASSISTANT: Sure, may I know your good name?

USER: Sure. This is Kenneth Evans.

ASSISTANT: Just hold on for a second.

USER: OK.

ASSISTANT: Sorry, no reservation found for you. Thank you.Have a great day.

USER: Oh! that's really sad. Thank you for your quick response.