You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you for the day?

USER: Owning to an emergency I want to cancel my recent reservation. Can you please help me with this?

ASSISTANT: Let me know your name to check your reservation?

USER: Sure, I am David Parker.

ASSISTANT: Ok, please wait a moment.

USER: Ok.

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, not an issue. Thank you for checking.

ASSISTANT: Thank you for choosing us.