You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I aid you?

USER: I would like to book a flight ticket from DCA to EWR to meet my childhood friends..

ASSISTANT: Sure, We are here to help you. Can I know your travelling dates?

USER: Sure, Mar 3 and Mar 5 are my travelling dates.

ASSISTANT: Do you need any break?

USER: Yes. I am Helen Hernandez.

ASSISTANT: Thank you for providing me your name. Is there any other specifications?

USER: No.

ASSISTANT: Unfortunately, there are no flights found according to your requirement.

USER: No problem, thank you for the information.

ASSISTANT: Thank you for picking us.