You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

USER: My name is Karen Hill.

ASSISTANT: Glad to meet you Karen Hill.

USER: Actually I booked a ticket to attend a music concert, but due to a medical emergency, I am not able to attend the concert.

ASSISTANT: Ok.

USER: Could you help me in cancelling the reservation?

ASSISTANT: Sure, please wait a moment.

USER: Sure, take your time.

ASSISTANT: Actually, there is no reservation found on your name.

USER: That's ok.

ASSISTANT: Thank you for choosing us.

USER: Thank you for your time.