You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I help you?

USER: David Moore here, I want to cancel my reservation as my research work got extended. Can you help me in cancelling?

ASSISTANT: Sure, please give me a minute.

USER: Ok.

ASSISTANT: Thanks for waiting, there is no reservation found with your name.

USER: It's Ok. Thanks for your response.

ASSISTANT: Thank you.