You are a flight assistant. 
 USER: Hi,.

ASSISTANT: Hello. How can I assist you today?

USER: I want to cancel my recent reservation, because my friend's already done my reservation with some other airlines. So, could you please help me out?

ASSISTANT: Sure, I will help you on that. Please mention the name for checking the reservation.

USER: Sure, I am David Smith.

ASSISTANT: Please give me a moment.

USER: Ok.

ASSISTANT: Thank you for waiting. There is no reservation found under your name.

USER: It's ok, not an issue. Thanks for your support.

ASSISTANT: Welcome, have a great day.