You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you today?

USER: Can you please help me to change my reservation?

ASSISTANT: Sure, may I know your name to check further?

USER: My name is Patrick Gonzalez.

ASSISTANT: Please stand by.

USER: Sure.

ASSISTANT:  Sorry, no reservation found on your given name in our database to change it.

USER: Ok, not an issue. Thank you.

ASSISTANT: Thank you for contacting us.