You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, what type of help you are looking from our service?

USER: Yesterday I booked a ticket to New York through your agency,  mistakenly I have mentioned  wrong dates and with that wrong dates I have reserved my flight ticket, so I want to cancel my reservation. Please help me out.

ASSISTANT: Yes, our agency will provide you a service to cancel your reservation. Can you please provide your name to check the existing reservation under your name in our listings?

USER: I have reserved my flight ticket in the name of Karen Green, Please my flight ticket in your data base.

ASSISTANT: Sorry Green, there is no reservation in our listing on your name to cancel.

USER: Not an issue, I will go with another reservation with correct dates. Anyway thank you for the information.

ASSISTANT: My pleasure, thank you for opting our service. Hope you have a great day.