You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you at this moment?

USER: I do not want to travel in the flight which I booked previously. I heard from many people that the airlines is not giving good service, can you help me to do some modifications?

ASSISTANT: Sure, I will help you with that.

USER: Thanks.

ASSISTANT: Can you please provide me name on which you reserved a ticket earlier?

USER: Sure, my name is Ronald Lee.

ASSISTANT: Ok, please wait a moment.

USER: Ok.

ASSISTANT: Sorry Lee, there is no reservation found under your name.

USER: It's ok no problem.

ASSISTANT: Thank you for choosing us.

USER: Thank you for your information.