You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I aid you?

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

ASSISTANT: Sure, I will help you. Please wait a minute.

USER: Sure.

ASSISTANT: Thanks for waiting, there is no active reservation on your name.

USER: That's ok, thank you.

ASSISTANT: Thank you.