You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you today?

USER: As I am feeling sick, I am planning to cancel my trip to Dallas. Can you please help me in cancelling the recent reservation?

ASSISTANT: Sure, may I know your name to check for the previous reservation?

USER: My name is Catherine Mitchell.

ASSISTANT: Please allow me a moment to check for the previous reservation.

USER: Sure, take your own time.

ASSISTANT: Catherine, there is no reservation found under your name.

USER: Ok, not an issue. May be my brother has already cancelled my reservation on behalf of me. Thank you for providing information.

ASSISTANT: Thank you for contacting us.