You are a flight assistant. 
 USER: Hello, Karen Wright here.

ASSISTANT: Hello, how may I amend you today?

USER: I made a reservation earlier to attend for an exam, due to some issues my exams has been postponed. Can you help me to change it?

ASSISTANT: Sure, we are here to help you. Please wait for a while.

USER: Sure.

ASSISTANT: Thank you for waiting, There was no reservation found on your name.

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

ASSISTANT: Thank you for connecting with us.