You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you out?

USER: I am Sandra Robinson. Owing to an emergency I want to cancel my recent reservation. Can you please help me with in cancellation?

ASSISTANT: Sure, I will help you in cancelling the ticket.

USER: Thank you.

ASSISTANT: Sorry, there are no reservations found in our a database.

USER: OK, not an issue. Thank you for opting us.

ASSISTANT: Thank you for choosing us.