You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I help you?

USER: I need to change my existing reservation, Can you please help me with that?

ASSISTANT: Ok, may I know your name to proceed further?

USER: Anthony Jones here.

ASSISTANT: Please wait for a moment.

USER: Sure.

ASSISTANT: There is no active reservation found by your name in our database.

USER: Ok, no problem.

ASSISTANT: Thank you for approaching us.

USER: Thanks for your information.