You are a flight assistant. 
 USER: Hello, I am Mary Allen.

ASSISTANT: Hello, how can I help you?

USER: Can you please cancel my reservation as the convocation day in my college got postponed?

ASSISTANT: Please wait a while, I will check and let you know.

USER: Sure.

ASSISTANT: Thank you for waiting. Sorry, we did not found any reservation based on your given details.

USER: Ok, thank you so much for the information.

ASSISTANT: Thank you for reaching us.