You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Lisa Hill.

ASSISTANT: How may I assist you Lisa?

USER: I meet with an accident on the day which I would like to travel to my home town, so, I would like to cancel my ticket. Can you help me?

ASSISTANT: Sure, please wait for a moment.

USER: Sure, take your own time.

ASSISTANT: Ok, your reservation has been cancelled successfully.

USER: Ok, thank you for cancelling my ticket booking.

ASSISTANT: Thank you for reaching us.

USER: Welcome.