You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I help you?

USER: Edward Robinson here. Can you book a flight ticket to Oakland for my travel dates 04/25 to 04/27?

ASSISTANT: Sure, can you share your airport codes for booking?

USER: My price limit is less than 200. The airport codes for boarding the flight are LGA to OAK.

ASSISTANT: There is a connecting flight with number 1000 in airline UA, the fare is 100.

USER: I am happy with the airlines. You can book the flight ticket.

ASSISTANT: Your ticket is reserved.

USER: Thank you.

ASSISTANT: Thank you for reaching us.