You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello,.

USER: Donna King here.

ASSISTANT: How can I aid you?

USER: I would like to travel from OAK to IAD. can you please help me to book a ticket?

ASSISTANT: Sure, please mention your trip dates?

USER: My travelling dates will be on 08/18 to 08/20.

ASSISTANT: Please wait for a second.

USER: Ok.

ASSISTANT: I found a Spirit airline with flight number 1013 and fare of 100. Shall I proceed?

USER: You can proceed to booking.

ASSISTANT: Your ticket is processed with a connecting flight.

USER: Thank you.

ASSISTANT: Thanks for opting us.