You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I guide to you?

USER: I had an important meeting in the dates of my trip, so I need to cancel my recent reservation. Can you help me?

ASSISTANT: Yes,  please I will help you with cancelling your ticket.

USER: Thank you.

ASSISTANT: Yes, Please provide your name while, you made your previous booking.

USER: My name is Elizabeth Johnson.

ASSISTANT: May I place this conversation on hold to check your ticket details?

USER: Yes, carry on.

ASSISTANT: Ok, thank you for waiting. Johnson, I could not found any previous booking on your name to cancel your booking, I think your ticket is previously cancelled.

USER: Ok, may be my brother had cancelled the previous booking.

ASSISTANT: Ok, that's fine, thank you for reaching us with your query. Have a good day.

USER: Thank you.

ASSISTANT: Welcome.