You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: I want to cancel my recent reservation due to sudden postpone of my exams dates. Can you help me out?

ASSISTANT: Let me know your name.

USER: I am Benjamin Green.

ASSISTANT: Sorry, no reservation found by your name.

USER: Ok, no issues.

ASSISTANT: Thank you.

USER: Thank you.