You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: My name is Dorothy Hernandez.

ASSISTANT: How may I guide you?

USER: I friend has invited to attend a sudden party at his house. I would like to cancel my reservation. Can you help me?

ASSISTANT: Sure, please wait a moment.

USER: Sure.

ASSISTANT: Dorothy, no reservation has been found on your name in our database.

USER: Ok, no problem. Thank you for your information.

ASSISTANT: Thank you for choosing us.