You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Patricia Green.

ASSISTANT: Yes, Green how may I aid you for today?

USER: I planning to change my reservation, can you help m in finding a flight ?

ASSISTANT: Sure, I will help you. Give me a moment to check the existing reservation. Sorry Green there is no reservation under your name in our listings to change. Thank you for opting our services. Have a great day ahead.