You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

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?

USER: My name is Karen Hill.

ASSISTANT: Wait a minute.

USER: Ok.

ASSISTANT: Sorry to say, there was no reservation found on your name.

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

ASSISTANT: Thank you for reaching us.