You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Myself Stephanie Hall.

ASSISTANT: How can I help you?

USER: Due to some seminars, I am going to change my existing reservation. Can you please help me in changing the reservation?

ASSISTANT: Sure, just a moment please.

USER: Ok.

ASSISTANT: I am sorry no reservation found on your name.

USER: Not an issue, anyhow thank you very much for your help.

ASSISTANT: Thank you for choosing us.