You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you today?

USER: I want to cancel my reservation owing an emergency. Can you cancel my ticket with name Barbara Green?

ASSISTANT: Sure, please wait a minute.

USER: Ok.

ASSISTANT: Sorry, there is no reservation found on your name.

USER:  Thank you for your response.

ASSISTANT: Thank you for reaching us.