You are a flight assistant. 
 USER: Hello, I am Frank Wright.

ASSISTANT: Hello, how may I help you at this moment?

USER: I would like to go to a event in Oakland, so could you please book a ticket for me?

ASSISTANT: Sure, I will help you. Please send your travelling dates.

USER: Sure, I would like to go on 05/19 and return back on 05/21.

ASSISTANT: Noted. Please provide your nearby airport codes.

USER: My source and destination airport codes are CLT and OAK.

ASSISTANT: Can I have a moment please? I will check the availability.

USER: Ok, ensure it is a single connecting flight.

ASSISTANT: There is a connecting flight available with Delta airline, shall I book it?

USER: Ok, please proceed for further if it costs you below 200.

ASSISTANT: Your booking is done with flight number 1022. Happy journey.

USER: Thank you for booking.

ASSISTANT: You are welcome, have a nice day.