You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: Brenda Rodriguez here, could you please cancel my ticket reservation done previously?

ASSISTANT: Sure. Please wait a moment I will check the reservation with your name.

USER: Ok.

ASSISTANT: We found that there is no reservation found with your name.

USER: Ok, can I know the time limit when can I expect the refund?

ASSISTANT: You will get your refund with in four working days.

USER: Thank you for your response, I will recheck with my details in my mail.

ASSISTANT: Thank you for contacting us.