You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you today?

USER: Deborah Clark here. Due to sudden change in my planned location of journey, I would like to change my reservation. Can you please help me out with that?

ASSISTANT: Sure, Deborah Clark, I will help you with that changing  reservation.

USER: Thank you for considering my request.

ASSISTANT: Thank you for waiting.

USER: It's alright.

ASSISTANT: Sorry to tell you that. there is no active reservation found with your name in your data base to change it.

USER: Oh! I think the ticket was not booked due to server issue. Anyway, thank you for the information.

ASSISTANT: Thank you for contacting us, have a great day.

USER: Welcome.