You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I help you today?

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

ASSISTANT: Sure, I am here to help you with that, can I know your good name to proceed further?

USER: I am Frank Allen.

ASSISTANT: I am sorry to say you that there is no reservation found under your name in our database.

USER: It's ok, thank you.

ASSISTANT: Thank you for opting us.