You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I serve you today?

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

ASSISTANT: Sure, may I know your name please?

USER: My name is Carol Harris.

ASSISTANT: Sorry we could not find any reservation on your name.

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

ASSISTANT: Thank you for choosing us.