You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Mark Davis.

ASSISTANT: How can I assist you today?

USER: Can you help me in cancelling my recent reservation?

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

USER: Ok.

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

USER: Not a problem, thank you for your help.

ASSISTANT: You are welcome. Thank you for contacting us.