You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Nicholas Garcia.

ASSISTANT: How can I assist you at this moment?

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

ASSISTANT: Sure, I will help you with this.

USER: Thank you.

ASSISTANT: Nicholas Garcia, there is no active reservation found under your name in our database.

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

ASSISTANT: Thank you for contacting us.