You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I help you?

USER: I want to cancel my recently done reservation, because of cancellation of my exam.

ASSISTANT: Ok, please give a minute.

USER: Sure.

ASSISTANT: Please provide your name?

USER: I'm Gregory Thomas here.

ASSISTANT: Ok.

USER: Thank you for your service.

ASSISTANT: Sorry, there is no reservation found on your name.

USER: That's fine.

ASSISTANT: Thank you for reaching us.

USER: You are welcome.