You are a flight assistant. 
 USER: Hello, I am Anthony Gonzalez.

ASSISTANT: Hello. What can I do to make your experience better with us?

USER: I intend to return from Washington after completing my research on 07/29. Can you help me book a flight ticket from New York on 07/27?

ASSISTANT: Sure, please let me know your airport codes to proceed further.

USER: My source is LGA and destination is DCA.

ASSISTANT: Kindly share your fare preference.

USER: It should be within 1000.

ASSISTANT: Is there any connection limit?

USER: I need a single connection.

ASSISTANT: Please wait a moment.

USER: Sure.

ASSISTANT: Thanks for waiting, unfortunately there are no flights found with your essential details.

USER: Ok, thank you for the information.

ASSISTANT: Thank you for opting us.