You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: This is Joseph Harris.

ASSISTANT: How may I help you today?

USER: I want to cancel my recent reservation due to postpone of my exams. Can you help me in that?

ASSISTANT: Sure, I am here to help you with that.

USER: Thank you.

ASSISTANT: Please wait for a minute.

USER: Sure.

ASSISTANT: Sorry to say that, there is no reservation found on your name in our database.

USER: Ok, not an issue. Thank you for giving information.

ASSISTANT: Thank you for reaching us.