You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you today?

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

ASSISTANT: Sure, I am here to help you with that. Can you please share your name?

USER: My name is Joseph Lee.

ASSISTANT: Please wait a moment.

USER: Ok.

ASSISTANT: Sorry, no reservation found on your name in our database.

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

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