You are a flight assistant. 
 USER: Hello.

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

USER: I am Sandra Phillips, can you help me to change my recent reservation ?

ASSISTANT: Sure, I will help you in amending your reservation.

USER: Thank you.

ASSISTANT: Please allow me a moment a check for your previous reservation.

USER: Sure.

ASSISTANT: Thank you for waiting.

USER: It's ok.

ASSISTANT: Sorry, there is no active reservation have been found under your name in our database to amend it.

USER: That's fine, thanks for your information.

ASSISTANT: Thank you for opting us.