You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you for today?

USER: I am Kathleen Collins. I heard that your agency gives quick service, I want to do some modifications in my previous reservation, can you please help me in modify the reservation?

ASSISTANT: Sure, I will help you with that.

USER: Ok.

ASSISTANT: Sorry, there is no previous reservation found on your name to change.

USER: Ok, it's alright, no problem, thank you for your help in searching.

ASSISTANT: You are welcome. Have a great day.

USER: Thank you.