You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: Myself William Thomas. Owing for an emergency, I want to cancel my reservation. Please help me.

ASSISTANT: How can I assist you today? Ok, I will help you with that.

USER: Thank you.

ASSISTANT: Thank you for waiting, sorry as per the reservation records there is no reservation been found on your name.

USER: Sad to hear that. Anyway, thank you.

ASSISTANT: Thank you for choosing our agency.