You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I support you?

USER: Joseph Brown here. I want to cancel my recent reservation because my trip dates are postponed, can you help me?

ASSISTANT: Sure, I am here to aid you. Please wait for a while, I will check the status and get back to you.

USER: Sure, take your own time.

ASSISTANT: Thank you for being patient, There was no reservation found on your name in our database.

USER: It's ok, thank you for checking.

ASSISTANT: Thank you for choosing us.