You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I assist you?

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

ASSISTANT: Sure, please provide your itinerary dates.

USER: I want to travel on July 22 and return on July 24.

ASSISTANT: May I know your name?

USER: My name is Barbara Hill.

ASSISTANT: Which class do you prefer?

USER: I am comfortable with any class.

ASSISTANT: Please hold on for a while.

USER: Please make sure that, flight with one connection and depart in the morning, return in the afternoon.

ASSISTANT: Sorry Barbara Hill, no flights are available on your route.

USER: Not a problem, thank you for the information.

ASSISTANT: Thank you for reaching us.