You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I support you today?

USER: I want to change my reservation because my trip has been postponed, can you assist me?

ASSISTANT: Sure, I'll try to help you in changing an existing reservation.

USER: Benjamin Turner.

ASSISTANT: Thank you for giving your name, give me some time.

USER: Sure.

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

USER: No problem, thank you for searching.

ASSISTANT: Thank you for approaching us.