You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Richard Miller.

ASSISTANT: How can I assist you?

USER: As my plans to visit Dallas got cancelled, can you please cancel my recent reservation?

ASSISTANT: Ok, please wait for a while.

USER: Sure.

ASSISTANT: Sorry, I did not find any reservation on your name to cancel.

USER: Ok, not an issue. May be something went wrong while booking the ticket previously. Thank you for providing information.

ASSISTANT: It's my pleasure, thank you for contacting us.