You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: Thomas Parker here.

ASSISTANT: How can I aid you?

USER: I would like to cancel my reservation, as I got a last moment invitation. Can you help me?

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

USER: Oh! That's fine, thank you for checking.

ASSISTANT: Thank you for opting us.

USER: Most welcome.