You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I aid you?

USER: I need to cancel my reservation as my plan to go for trekking got cancelled. Can you help me?

ASSISTANT: May I know your name?

USER: I am Donna Roberts.

ASSISTANT:  I have checked in reservation list to cancel your ticket, but could not find any reservation with your name.

USER: Ok fine, thanks for your response.

ASSISTANT: Thank you.