You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I aid you?

USER: I am Mark Smith. I want to cancel my recent reservation. Can you help me with this?

ASSISTANT: Sure, we are here to help you. Please wait.

USER: Thank you. Sure.

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

USER: No problem, thanks for your information.

ASSISTANT: Thank you for contacting us.