You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I address you?

USER: I am planning for a round trip to DC-IAD, please help me with booking.

ASSISTANT: Sure, when would you like to travel?

USER: My travelling dates are from 11/13 to 11/15.

ASSISTANT: Do you have any other specifications?

USER: I need a halt in between my journey.

ASSISTANT: May I know your good name please?

USER: I am Linda Hernandez.

ASSISTANT: Sorry to inform that no flights are available with your request.

USER: Thanks for the information.

ASSISTANT: Thanks for opting us.