You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: My name is Brandon Moore.

ASSISTANT: Ok.

USER: I want to change my existing reservation due to heavy rainfall.

ASSISTANT: Sure. Please wait for a while.

USER: Ok.

ASSISTANT: I am happy to tell that there is a reservation found your name. May I know your new travelling dates?

USER: My departure day is 06/05, return day is 06/07.

ASSISTANT: May I know your airport codes?

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

ASSISTANT: Please mention your price limit?

USER: My price limit is 5000.

ASSISTANT: There is a Delta 1017 airline which matches your requested dates. Shall I proceed with booking?

USER: Yes, please.

ASSISTANT: Your booking has been confirmed on name of Brandon Moore.

USER: Thank you.

ASSISTANT: Thank you for approaching us.