You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you today?

USER: I am Steven Hernandez.

ASSISTANT: Ok.

USER: I want to cancel my recent reservation due to an emergency work.

ASSISTANT: Sure, let me check the reservation list and get back to you.

USER: Ok, I will wait.

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

USER: No problem, thank you for your help.

ASSISTANT: Thank you for choosing us.