You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I serve you?

USER: My plan for going on trip to Washington with my friends has been cancelled. So I want you to cancel my existing reservation, can you help me with that?

ASSISTANT: Ok, we will surely help you with that. Can I have your name to check your details?

USER: Sure, I had a earlier reservation with name Carol Thompson.

ASSISTANT: Ok, let me check the status and I will revert to you.

USER: Sure.

ASSISTANT: Carol Thompson, sorry to inform you that there is no active reservation found in our database to cancel.

USER: Ok, no worries at all. I appreciate your quality service.

ASSISTANT: Thank you for reaching us.