You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, What kind of help are you expecting from our side?

USER: I want to change my existing reservation due to prepone of my exams. Can you please help me in that?

ASSISTANT: Sure, I can change your reservation right now. Before that I need to know your good name please?

USER: Anna Jones here.

ASSISTANT: Ok, wait for some time I will check the reservation on your name and get back to you.

USER: Ok, take your own time.

ASSISTANT: We are sorry to say that, there is no active reservation found on your name.

USER: Ok, not an issue. Thank you for checking.

ASSISTANT: Thanks for reaching us, wish you a great day.