You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: I am Donna Lewis here. I need to cancel my  existing reservation, as my planned trip with my friends got cancelled. Can you please help me out?

ASSISTANT: Please wait for a moment.

USER: Thank you for considering my request.

ASSISTANT: Sorry, there is no reservation matching with your name in our portal.

USER: Ok, it may be cancelled by my manager but he did not inform me yet.

ASSISTANT: Thank you for reaching us.

USER: Anyway, thank you for the information.