You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am John Clark.

ASSISTANT: How may I help you today?

USER: I need to cancel my reservation due to some issues in my location, can you help me out?

ASSISTANT: Sure, I am gleeful to help you to cancel your reservation.

USER: Thank you for considering my concern.

ASSISTANT: Sorry, no reservation found on your name to cancel your reservation.

USER: That's ok, not an issue. Thank you for your information.

ASSISTANT: Thank you for opting us.