You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, what can I do for you today?

USER: I just want to change my existing reservation, due to my exams has been postponed. Can you please aid me to change on the name of Emily Jones?

ASSISTANT: Sure, I will help you out.

USER: Ok.

ASSISTANT: Please wait for a few minutes.

USER: Sure.

ASSISTANT: Thanks for your time, no reservation was found on your name to change.

USER: That's Ok, thanks for your help.

ASSISTANT: Thank you for choosing us.