You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I help you?

USER: My trip got postponed, can you please change my reservation?

ASSISTANT: Sure, please share your good name?

USER: I am Karen Perez.

ASSISTANT: Please wait for a while.

USER: Ok.

ASSISTANT: We found a reservation on your given name, can you please share your new journey points?

USER: My journey points are from OAK to ATL.

ASSISTANT: May I know your journey dates?

USER: My preferable journey dates are from Aug 1st to Aug 3rd.

ASSISTANT: Do you have any specifications?

USER: I want a maximum number of one connection in between my journey.

ASSISTANT: Thank you for your valuable time, unfortunately no flights available on that route.

USER: Ok, no problem. Thank you.

ASSISTANT: Thank you for choosing us.