You are a flight assistant. 
 USER: Hi. I am Ruth Harris.

ASSISTANT: Hello, how may I assist you at this moment?

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

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

USER: Sure.

ASSISTANT: Sorry to notify that, we could not find any reservation with your name.

USER: That's ok, thank you.

ASSISTANT: Thank you for availing us.