You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: Actually my seminar is postponed so that I want to change my existing reservation, can you help me?

ASSISTANT: Sure, I will help you. Please provide your name?

USER: Sure, I am Carol Adams.

ASSISTANT: Ok, please wait for a moment.

USER: OK.

ASSISTANT: Sorry Adams, in my database I didn't found any reservation with your details.

USER: Oh! that's fine.

ASSISTANT: Thank you for reaching us.

USER: Thank you for your information.

ASSISTANT: You are welcome. Have a nice day.

USER: You are welcome.