You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, welcome to RJD agency. How can I guide you today?

USER: Previously I reserved a flight ticket with high cost with the help of your agency. Present, I heard that there is a special flight in my route with low fare. I want to cancel my existing reservation, will you help me in cancelling my existing ticket?

ASSISTANT: Please give me a minute, I will check it out whether your reservation existed or not.

USER: Ok.

ASSISTANT: Can I know your name to check the previous reservation?

USER: My name is Sandra Parker.

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

USER: It's ok.

ASSISTANT: Thank you for reaching us.

USER: Thank you for your response, happy to have a nice discussion with you.

ASSISTANT: Thank you. Have a great day.