You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: My name is Karen Parker.

ASSISTANT: Karen, what kind of help are you expecting from my side?

USER: I think I am at the right place, I had recently reserved a flight ticket and suddenly I meet with the accident and I am unable to go with that flight, so I want to change my dates of travel.

ASSISTANT: Sure, hold on for a moment, let me check.

USER: Ok, take your time.

ASSISTANT: I am sorry to inform you that there are no reservations existing with your name.

USER: That's ok.

ASSISTANT: Would you like to book a new reservation?

USER: No, presently I don't have any other plans.

ASSISTANT: Thank you, have a good day ahead.

USER: Thank you for your valuable time.