You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Mark Moore.

ASSISTANT: How can I assist you today?

USER: Can you help me in cancelling my recent reservation, as my exam is postponed?

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

USER: Ok.

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

USER: That's ok, thank you for reaching us.

ASSISTANT: Thank you for reaching us, have a great day.