You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Joseph Perez.

ASSISTANT: How can I assist you today?

USER: In the past week I had booked a ticket, but due to health issues, I would like to cancel it, can you help in that?

ASSISTANT: Sure, I will definitely help you with that. Please give me a moment.

USER: Sure, take your time.

ASSISTANT: Thank you for waiting. Your reservation is successfully cancelled.

USER: Ok, thank you for cancelling my booking.

ASSISTANT: It's my pleasure, have a great day.