You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I assist you for today?

USER: Can you help me in changing my recent reservation, as my exam is postponed?

ASSISTANT: I am glad to help you in changing your reservation.

USER: Ok.

ASSISTANT: Can you please provide your name for checking the reservation status?

USER: I am Betty Green.

ASSISTANT: I have found reservation, can you please provide your modification airport codes?

USER: Well, my source is LAX and destination is SFO.

ASSISTANT: Can you please provide your planned dates of journey?

USER: My trip dates are Oct 29 to Oct 31.

ASSISTANT: Do you need any connecting flight for your journey?

USER: I need a direct flight.

ASSISTANT: Do you have any other requirements for your journey?

USER: No.

ASSISTANT: Sorry Betty Green, there are no flights to your region on your planned dates of journey.

USER: No issue, thank you for checking.

ASSISTANT: You are welcome, thank you for reaching us.