You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I assist you?

USER: I want to change my reservation, can you help me with that?

ASSISTANT: May I know your good name to check the reservation status?

USER: Anthony Green here.

ASSISTANT: Sorry, there is no reservation found on your given name in our reservation database.

USER: Ok, no issues. Thanks for the information.

ASSISTANT: Thank you for choosing us.