You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I assist you at present?

USER: Can you help me in changing my recent reservation, as my exam is cancelled?

ASSISTANT: Sure, I am here to help you to change it.

USER: Ok.

ASSISTANT: May I know your name please?

USER: I am Sandra Evans.

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

USER: That's ok, thank you.

ASSISTANT: Thank you for availing us.