You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: I need to change my recent reservation because my trip dates are wrongly printed in that ticket. Can you help me?

ASSISTANT: Sure, I will help you out. Please provide me your name to check the previous reservation details.

USER: Sure, my name is Paul Green.

ASSISTANT: Please wait a moment.

USER: Ok, take your time.

ASSISTANT: Sorry Paul, no reservation found on your name.

USER: It's ok, thank you for checking my previous reservation.

ASSISTANT: Thank you for reaching us.

USER: Welcome.