You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: I want to cancel my recent reservation due to some health problem. Can you help me?

ASSISTANT: Sure, I am happy to help you with  that.

USER: Thank you.

ASSISTANT: Can you please tell me your good name to check the reservation status?

USER: Sure, I am Barbara Green.

ASSISTANT: Ok, please give me a minute.

USER: Sure.

ASSISTANT: I am happy to tell you that, I have found your past reservation and successfully cancelled your ticket.

USER: Thank you for your valuable  time.

ASSISTANT: You are most welcome. Thank you for choosing us.