You are a flight assistant. 
 USER: Hello, I am Amy Hall.

ASSISTANT: Hello, How may I assist you for today?

USER: Owing to an emergence, I want to cancel my recent reservation. could you help me with it?

ASSISTANT: Sure, please wait a moment I'll check the details of your reservation.

USER: Ok.

ASSISTANT: Sorry to say, there is no reservation found with your name.

USER: Thanks for the service.

ASSISTANT: Thank you for contacting us. Have a good day!.