You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you today?

USER: Can you please change my existing reservation?

ASSISTANT: Sure, I will help you in changing. May I know your good name please?

USER: Sure, I am Laura Green.

ASSISTANT: Please give me a moment.

USER: Sure.

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

USER: Ok, not an issue. Thank you for your information.

ASSISTANT: Thank you for choosing us.