You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello,.

USER: Christopher Lewis here.

ASSISTANT: How can I help you?

USER: Can you please help me in booking the ticket from DCA to OAK? As I need to join my friends in trekking at Oakland hills.

ASSISTANT: Please mention your travelling dates?

USER: Sure, my travel dates are 12/28 and 12/30.

ASSISTANT: Please provide connections limit?

USER: I need 1 halt in between.

ASSISTANT: Ticket is available with airline Frontier having flight number 1015 and price is 100.

USER: That's fine, please proceed for booking.

ASSISTANT: Your ticket is booked.

USER: Thank you so much for your help.

ASSISTANT: Thanks.