You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: My Hockey competition was postponed, so I need to change my existing reservation. Could you help me with that?

ASSISTANT: Sure, may I know your name please?

USER: My name is Dennis Brown.

ASSISTANT: Yes,  do you have any other dates?

USER: My trip dates are 04/13 and 04/15.

ASSISTANT: Sorry, Brown no reservation found on your request.

USER: It's ok, thank you for the information.

ASSISTANT: Thank you for contacting us.