You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you today?

USER: Can you please change my existing reservation?

ASSISTANT: Sure, we are here to help you. Can I have your name to proceed further?

USER: I am Stephanie Carter.

ASSISTANT: Ok, please wait for a while, let me check your reservation and revert to you.

USER: Ok.

ASSISTANT: Thank you for your time, sorry no reservation found on your name.

USER: Ok, not an issue. Thank you for your information.

ASSISTANT: Thank you for opting us.