You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: I am Jacob Allen, I want to change my journey date as my plan to visit Seattle to meet my client is postponed. Can you change my reservation?

ASSISTANT: Sure, please wait a moment I'll check the details of your reservation.

USER: Sure.

ASSISTANT: Sorry to say, in my database I didn't found any details regarding your reservation.

USER: Ok, thanks for the information.

ASSISTANT: Thanks for availing us, have a pleasant day.