You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Joseph Jackson.

ASSISTANT: How may I assist you today?

USER:  I want to cancel my recent reservation as my engagement is postponed. Can you please help me out?

ASSISTANT: Sure. Joseph, let me check with your details.

USER: Ok.

ASSISTANT: Joseph, there is no reservation found under your name.

USER: That's ok. Thank you for your time.

ASSISTANT: Thank you for contacting us.