You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I assist you?

USER: I want to change my existing reservation. Can you help me for that one?

ASSISTANT: Sure, I am here to help you out. May I know you name please?

USER: Sure, Amy  Hill here.

ASSISTANT: Wait a moment please.

USER: Sure.

ASSISTANT: Amy Hill, we haven't found any reservation under your name in our database.

USER: No issues, thank you for the information.

ASSISTANT: Thank you for choosing us.