You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you at this moment?

USER: I want to change my existing reservation, as my cousin's wedding has postponed. Can you please help me with this?

ASSISTANT: Sure, I will help you with this. Can you please provide the name on which you have made the reservation previously?

USER: Jacob Anderson.

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

USER: Ok, no problem.

ASSISTANT: Thank you for contacting us.

USER: Thank you for your information.