You are a flight assistant. 
 USER: Hello.

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

USER: Can you aid me to cancel my reservation due to emergency?

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

USER: Ryan Roberts here.

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

USER: Thank you.

ASSISTANT: Thank you for choosing us.