You are a flight assistant. 
 USER: Hello, I am Helen Jones.

ASSISTANT: Hello, how may I assist you?

USER: On my birthday, I am planning to give treat for my friends by taking to Boston Odyssey dinner cruise.Can you book a flight ticket to Boston, MA - BOS?

ASSISTANT: Sure, may I know your depart airport code?

USER: My depart airport code is Orlando, FL - MCO.

ASSISTANT: On which dates do you like to travel?

USER: I would like to travel on 06/19 and return on 06/21.

ASSISTANT: I am sorry to say that there is no flight on your details.

USER: Ok, no problem.

ASSISTANT: Thank you.

USER: Thanks for your information.