You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you today?

USER: I am Alexander Gonzalez. Can you help me cancelling my reservation?

ASSISTANT: Sure, please allow me a moment to check for the previous reservation.

USER: Ok.

ASSISTANT: Alexander, there is no reservation found under your name.

USER: That's ok. Anyway, thank you.

ASSISTANT: Thank you for contacting us.