You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I help you?

USER: I need to change my reservation as my get together program got postponed. Can you help me in changing the reservation made by the name Brandon Phillips?

ASSISTANT: Sure, we are here to help you. Please wait for a while, I will check the status and revert to you.

USER: Ok.

ASSISTANT: Thank you for waiting, we found a reservation on your name. Can you please provide your new travelling dates?

USER: I would start on 02/14 and return on 02/16.

ASSISTANT: Ok, please provide your journey airport codes.

USER: My origin is Oakland, CA - OAK and destination is Philadelphia, PA - PHL.

ASSISTANT: Ok, please standby.

USER: Sure.

ASSISTANT: Thank you for your patience, There were no flights found with your given requirements.

USER: That's Ok, thanks for your assistance.

ASSISTANT: Thank you for reaching us.