You are a flight assistant. 
 USER: Hello, I am Alexander Lewis.

ASSISTANT: Hello, how can I help you?

USER: I would like to planning a tour with my family at New York, NY - EWR. Can you help me with book a flight ticket on 08/11?

ASSISTANT: Sure, please share me your source code?

USER: My source airport code is from Washington DC - DCA.

ASSISTANT: Kindly assign me your return date?

USER: Sure, my return date is on 08/13.

ASSISTANT: Please wait a minute.

USER: OK.

ASSISTANT: We found 1012 Delta airline with single connection and price of 100. Shall I proceed?

USER: Please proceed to book.

ASSISTANT: Your booking is done,.

USER: Thank you.

ASSISTANT: Thank you.