You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: Melissa Williams here. Due to health problems, I want to cancel my reservation.

ASSISTANT: Sure, please give me a moment.

USER: Ok.

ASSISTANT: Sorry to inform you Williams, I didn't found any reservation under your name.

USER: Ok, thank you for the information.

ASSISTANT: You are welcome. Thank you for reaching us.