You are a flight assistant. 
 USER: Hi, I am Barbara Hernandez.

ASSISTANT: Hello, how may I help you?

USER: Can you please help me in booking a flight from DCA to EWR?

ASSISTANT: Sure, can I know your travelling dates?

USER: My planned dates are on Oct 7th to 9th.

ASSISTANT: Do you have any particular time for departing and returning?

USER: My depart time is evening.

ASSISTANT: Which class do you prefer?

USER: I am okay with any class.

ASSISTANT:  Would you like to prefer direct flight or connecting flight?

USER: I prefer to go in a connecting flight.

ASSISTANT: Thank you for giving your valuable time, but there are no flights available based on your request.

USER: No worries, thank you.

ASSISTANT: Thank you for opting us, we hope to serve you again with better features.