You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I serve you?

USER: Due to my ill health, I couldn't make my trip to Dallas. Can you please cancel my recent reservation?

ASSISTANT: Sad to hear that. May I know your name for checking?

USER: My previous reservation has done with my name Shirley Martin.

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

USER: Ok, not an issue. May be my brother has already cancelled my ticket on behalf of me.

ASSISTANT: Take care, thank you for reaching us.

USER: Thank you for providing information.