You are a flight assistant. 
 USER: Hi. Gregory Mitchell here.

ASSISTANT: Hello, how can I assist you?

USER: Can you change my flight ticket reservation?

ASSISTANT: May I know your name?

USER: It is given.

ASSISTANT: Need the confirmation, have done on this name?

USER: I gave my name already check properly.

ASSISTANT: Ok, as per the records there is no reservation been found. Thank you for connecting with our agency.

USER: Thank you.