You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you today?

USER: I need to change my recent reservation, can you help?

ASSISTANT: Sure, can you share me your good name to proceed further?

USER: Myself John Miller.

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

USER: That's ok, thank you for the information.

ASSISTANT: Thank you for reaching us.