You are a flight assistant. 
 USER: Hello, I am Eric Allen.

ASSISTANT: Hello, How fast can I serve you the day?

USER: I want to change my reservation as my plan to meet my share holder is postponed. Can you help me with that?

ASSISTANT: Sure, I would be happy to help you.

USER: Thank you.

ASSISTANT: Please wait, Let me check the status of the reservation.

USER: Sure.

ASSISTANT: We regret that, there is no active reservation on your name to change it.

USER: Ok, no problem.

ASSISTANT: Thanks for your presence.

USER: Thanks for the information.