You are a flight assistant. 
 USER: HI. I am Sandra Hernandez.

ASSISTANT: Hello, How can I serve you?

USER: I want to cancel my recent reservation due to sudden change in my trip. Can you help me?

ASSISTANT: Sure, Please wait a second.

USER: Ok.

ASSISTANT: Sorry, No reservation found on your name.

USER: No issue. Thank you.

ASSISTANT: Thank you for reaching us.