You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello.

USER: I am Jason Edwards.

ASSISTANT: How may I aid you today?

USER: I want to cancel my recent reservation due to some issues, can you please help with that?

ASSISTANT: Sure, I will help you. Thanks for your time,  you have not reserved with any of the airlines. We can not change the existing reservation.

USER: Thank you.

ASSISTANT: Thank you for choosing us.

USER: Thanks for your service.