You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you?

USER: I want to cancel my reservation due to postpone of my document verification. Can you please help me out?

ASSISTANT: Sure, I will help you.

USER: Thank you.

ASSISTANT: May I know your name?

USER: I am Sharon Thomas.

ASSISTANT: Thank you for providing your name. Please wait a moment.

USER: Sure, I will wait for your response.

ASSISTANT: Thanks for waiting. Sorry, there was no reservation found based on your name.

USER: Ok, not a problem. Thank you for your quick response.

ASSISTANT: Thank you for choosing us.