You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello,. How can I render you today?

USER: I am Barbara Carter.

ASSISTANT: Ok.

USER: Can you please cancel my ticket? Because I cancelled my business meeting, as my sister arrived home after a long time.

ASSISTANT: Sure, I am here to aid you.

USER: Thank you.

ASSISTANT: Please, wait for a while I will check with reservation and revert to you.

USER: Ok.

ASSISTANT: Thanks for waiting,  we did not find any reservation with your name.

USER: Ok, Thank you.

ASSISTANT: Thank you for availing us, have a nice day.