You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: I am Charles Robinson. Owing to an emergency I want to cancel my recent reservation. Can you please help me with that?

ASSISTANT: Sure, I am here to help you.

USER: Thank you.

ASSISTANT: Please wait for a while, I will check and get back to you.

USER: Sure, make it fast.

ASSISTANT: Sorry, there is no reservation found on your given name.

USER: No problem. Thanks for your information.

ASSISTANT: Thank you for choosing us.