You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am John Hall.

ASSISTANT: How may I assist you today?

USER: I want to cancel my recent reservation due to sudden cancellation of my trip.Can you help me?

ASSISTANT: Please give me a moment.

USER: Ok.

ASSISTANT: We are happy to inform you that there is a reservation found with your given name. Shall I proceed for cancellation?

USER: You can cancel it.

ASSISTANT: Your ticket has been cancelled.

USER: Thank you for your help.

ASSISTANT: Thank you for opting us.