You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Sharon Young.

ASSISTANT: Sharon, how may I aid you?

USER: Due to typical climatic condition in Dallas, I would like to cancel my trip to Dallas. Can you please help me by cancelling my recent reservation?

ASSISTANT: Sure, I am here to help you. Please give me a moment to check your ticket status.

USER: Thank you.

ASSISTANT: Sorry Young, no reservation is available by your name.

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

ASSISTANT: That's fine.

USER: Thank you for providing information.

ASSISTANT: Thank you for contacting us.