You are a flight assistant. 
 USER: HI. I am Karen Martinez.

ASSISTANT: Hello. How may I assist you?

USER: As my meeting is preponed, I want to cancel my reservation. Can you help me?

ASSISTANT: Sure, wait for a moment.

USER: Ok.

ASSISTANT: Sorry, there is no reservation found basis on your details.

USER: No issue, thank you for checking.

ASSISTANT: Thank you for reaching us.