You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I aid you at this moment?

USER: I am Barbara Turner. Can you help me in changing my recent reservation, as my exam is postponed?

ASSISTANT: Sure, I will help you with this. Please be on hold for a moment to check your reservation status.

USER: Sure.

ASSISTANT: Barbara Turner, there is no active reservation found under your name in our database.

USER: That's ok, thank you.

ASSISTANT: Thank you for contacting us.