You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: I need you to make few changes in my recent flight booking.

ASSISTANT: Sure, I am here to assist you. May I know your name?

USER: Thank you. My name is John Green.

ASSISTANT: Thank you. Please be online for a while, I will check your reservation status and let you know.

USER: No hurry, no worry. Take your time. I will be here.

ASSISTANT: Sorry, I did not find any reservation by your name in our database.

USER: That's ok. Thanks for your time.

ASSISTANT: You are welcome and have a nice day.