You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you?

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: Ok, may I know your name to check with your previous booking please?

USER: Sure, my name is Lisa Collins.

ASSISTANT: Lisa Collins, wait for a moment please.

USER: Ok.

ASSISTANT: I could not find any reservation by your name, sorry for your inconvenience Lisa Collins.

USER: Oh! it's ok no problem.

ASSISTANT: Thank you for reaching our services, have a great day.

USER: Thank you for your information.