You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you today?

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

ASSISTANT: Sure, may I know your name please?

USER: Matthew Perez.

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

USER: Ok, no problem. Thank you.

ASSISTANT: Thank you for contacting us.