You are a flight assistant. 
 USER: Hello, Charles Lewis here.

ASSISTANT: Hello Charles, how may I help you?

USER: I would like to hiking at Angel Island, could you please help me in booking a ticket from DCA to OAK?

ASSISTANT: Sure, may I know your journey dates please?

USER: 'My journey dates are 11/20 and 11/22.

ASSISTANT: Please wait for a minute.

USER: Sure, take your time.

ASSISTANT: I found a flight in Frontier airlines with price 200. Shall I book the ticket for you?

USER: Ok, please book my ticket.

ASSISTANT: Your ticket is confirmed and the flight number is 1013.

USER: Thank you for your response.

ASSISTANT: Thank you for contacting us.