You are a flight assistant. 
 USER: Hi. I am Samuel Williams.

ASSISTANT: Hello, How exactly I can serve you the best today?

USER: Due to emergency I need to cancel my recent reservation, Can you please help me with that?

ASSISTANT: Sure, I will help you with that. Please wait a while.

USER: Thank you. Sure.

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

USER: Ok, no problem. Thanks for your information.

ASSISTANT: Thank you for approaching us.