You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Benjamin Smith.

ASSISTANT: How can I assist you?

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

ASSISTANT: Sure, I will help you with that.

USER: Thank you.

ASSISTANT: Benjamin Smith, I have searched the database and I couldn't  find any active reservation 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.