You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: My name is Eric Allen.

ASSISTANT: Allen, how can I assist you?

USER: I would like to cancel my reservation due to assignment of unplanned work. Can you help me?

ASSISTANT: Sure, let me check your existing reservation details.

USER: Ok.

ASSISTANT: Sorry, we could not find a reservation by your name in our database.

USER: I guess my assistant has cancelled the ticket. Anyways, thank you for the information.

ASSISTANT: Thank you for contacting us.