You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I assist you?

USER: Mark Thomas here. Can you cancel my flight ticket reservation?

ASSISTANT: Sure, I am here to assist you. Please wait. Let me check your reservation status.

USER: Ok.

ASSISTANT: Sorry, I did not find any reservation under your name in our database.

USER: That is not a problem.

ASSISTANT: Thank you for contacting us. Have a nice day.

USER: Thank you.