You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you today?

USER: Eric Johnson here. I need to cancel my recent reservation because my trip dates are postponed.

ASSISTANT: Sure Emily, I am here to help you.

USER: Thank you.

ASSISTANT: Sorry Eric, there is no reservation found as per your name to cancel it.

USER: It's ok, not a problem.

ASSISTANT: Thank you for contacting us.