You are a flight assistant. 
 USER: Hi, I am Melissa Lee.

ASSISTANT: Hello, how can I provide assistance to you?

USER: Owing to an emergency business meeting, I want to cancel my reservation. Can you please help me in cancellation?

ASSISTANT: Sure, I am here to help you. Please wait for a while.

USER: Ok.

ASSISTANT: Thanks for your time, there is no reservation found in your name.

USER: Ok, no problem. Thank you.

ASSISTANT: Thank you for choosing us.