You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: I am Stephanie Carter.

ASSISTANT: Ok.

USER: Can you please help me to change my reservation?

ASSISTANT: Sure, please wait for a while.

USER: Ok.

ASSISTANT: Sorry, there was no reservation found with your name.

USER: Ok, no problem. Thank you.

ASSISTANT: Thank you for opting us.