You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you today?

USER: I am Stephanie Clark, I am looking for a direct flight to visit Dallas to meet my grand father. Can you book a flight under fare of 500?

ASSISTANT: Sure, can you please provide your airport locations?

USER: My source point is CA-OAK and destination is TX-DFW.

ASSISTANT: Kindly specify your departure and arrival dates?

USER: I will fly on 07/02 and return on 07/04.

ASSISTANT: Ok, please hold a moment.

USER: Sure.

ASSISTANT: Thank you for your time, unfortunately no flights found on that day.

USER: Ok, thank you for the information.

ASSISTANT: Thank you for availing us.