You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I render you today?

USER: William Wright here.

ASSISTANT: Ok.

USER: Can you please help me with cancelling my previous booking?

ASSISTANT: Sure, I will help you with that.

USER: Ok, I will be waiting for your response.

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: Oh! That's ok. Thank you for checking.

ASSISTANT: Thank you for choosing us.

USER: Welcome.