You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you today?

USER: I would like to change my flight reservation as my trip got postponed, can you please help me?

ASSISTANT: Sure, I will help you.

USER: Thank you.

ASSISTANT: Please help me with your name.

USER: My name is William Davis.

ASSISTANT: Please allow me a minute.

USER: Sure.

ASSISTANT: Thank you. William Davis, I am really sorry to inform you that there is no booking done on your name.

USER: Not an issue, thank you for the information.

ASSISTANT: Thank you for reaching us. Have a great time.