You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I aid you today?

USER: I am Christopher Parker. I would like to change my reservation as I am leaving for piligrimage, can you please help me out?

ASSISTANT: Sure, please wait a moment.

USER: Thank you. Sure.

ASSISTANT: Sorry Parker, there are no active reservation to change?

USER: Ok no problem, thank you for your services.

ASSISTANT: Thank you for reaching our service.