You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: Owing to an emergency, I would like to cancel my recent reservation. Will you help me with this?

ASSISTANT: Sure, may I know your name?

USER: My previous reservation has done with the name Sandra Mitchell.

ASSISTANT: Ok, wait a minute.

USER: Sure.

ASSISTANT: Sorry, there was no active reservation on your name.

USER: Oh! That seems my brother has already cancelled my reservation on behalf of me. Thank you for providing information.

ASSISTANT: Ok, thank you for reaching us.