You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I would like to change my flight reservation. Can you please help me?

ASSISTANT: Sure, I am here to assist you with that.

USER: Thank you.

ASSISTANT: May I know your name please?

USER: My name is Stephanie King.

ASSISTANT: Wait a moment please.

USER: Sure.

ASSISTANT: Stephanie King, we haven' found any reservation under your name in our database.

USER: No problem. Anyway, thank you for the information.

ASSISTANT: Thank you for choosing us.