You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: Here Dennis Evans. I would like to change my reservation.

ASSISTANT: Sure Evans, I am here to help you. Let me check your reservation status in our records.

USER: Thank you.

ASSISTANT: Evans sorry to intimate, no reservation is found in your name in our database.

USER: That's ok. Thanks for your information.

ASSISTANT: You are welcome.