You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you today?

USER: My name is Stephanie Carter, could you please help me in changing my existing reservation details?

ASSISTANT: Sure, I will help you with that.

USER: Thanks.

ASSISTANT: Please wait a moment, I will check your reservation status.

USER: Ok.

ASSISTANT: There is no previous reservation available in your name Stephanie Carter.

USER: That's ok, thank you.

ASSISTANT: Thank you for choosing us, have a good day.