You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

USER: I need to change my existing reservation due to some personal issues, can you help me in doing that?

ASSISTANT: Sure, I will help you in change of flight ticket reservation. May I know your name please?

USER: I am Stephanie Hill.

ASSISTANT: Thanks for your time. Sorry I have not found your flight reservation to change it.

USER: Ok, no issues.

ASSISTANT: Thank you.

USER: Thank you for the information.