You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, which service are you seeking for today?

USER: Jacob Lewis here. My wedding has been postponed, so I want to reschedule my itinerary dates.

ASSISTANT: Sure, I am here to help you out with that.

USER: Ok.

ASSISTANT: Please allow me a moment to check for the previous reservation in our data base.

USER: Sure.

ASSISTANT: We are sorry to say that, there is no active reservation found on your name to change.

USER: No problem, thank you.

ASSISTANT: Thanks for approaching us, wish you a nice day.