You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: I want to cancel my reservation, because my one of friend is busy with another work, he unable to catch that flight,  so we all are decided to cancel this trip, can you help me?

ASSISTANT: Sure, let me know your name so that I can help you easily.

USER: Sure, my name is David Clark.

ASSISTANT: Ok, let me check your status of your reservation.

USER: Ok.

ASSISTANT: Thanks for your patience, there is no reservation under your name David Clark.

USER: Oh, it's ok no problem. Thank you for your information.

ASSISTANT: Thank you for consulting us.