You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I help you?

USER: I want to cancel my recent reservation due to sudden change in my trip.

ASSISTANT: Ok, may I know your name to proceed further?

USER: I am Sandra Hill.

ASSISTANT: Ok, please stand by.

USER: Ok.

ASSISTANT: Thank you for your time, sorry no reservation found with your name.

USER: That's ok. Thank you for your response.

ASSISTANT: Thank you for reaching us, have a nice day.