You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: I would like to change my existing reservation due to postpone of my seminar. Could you please help me?

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

USER: I am Shirley Phillips.

ASSISTANT: Ok, please wait a minute.

USER: Sure.

ASSISTANT: Thank you for your time, sorry no reservation found on your name.

USER: No worries, thank you for the information.

ASSISTANT: Thank you for reaching us, have a nice day.