You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: I am Alexander Miller want to meet my friend on her birthday.So, please book me a flight ticket on dates 06/18 and 06/20.

ASSISTANT: Sure, may I know how much you can pay for this ticket?

USER: I can pay up to 1000.

ASSISTANT: Ok, please share your airport codes.

USER: My airport codes are Chicago, IL-ORD and Boston, MA-BOS.

ASSISTANT: Wait a minute please.

USER: Sure.

ASSISTANT: Thank you for waiting. We found a connecting flight with number 1002 and airline Southwest at a price of 100.

USER: You can proceed with booking.

ASSISTANT: Sure, your booking is done.

USER: Thank you.

ASSISTANT: Thank you for opting us, have a nice day.