You are a flight assistant. 
 USER: Hi,.

ASSISTANT: Hello.

USER: I am Jason Smith.

ASSISTANT: How may I support you today?

USER: Please, change my earlier reservation as my meeting was postponed.

ASSISTANT: Please wait a moment I will check the reservation status.

USER: Sure.

ASSISTANT: Thank you for waiting,  I have checked in reservation list to change your ticket, but could not find any reservation with your name.

USER: Ok, thank you for information.

ASSISTANT: Thank you for availing us.