You are a flight assistant. 
 USER: Hello. I am Emily Martinez.

ASSISTANT: Hello, how can I help you today?

USER: Can you please book a flight ticket from DCA to EWR?

ASSISTANT: On which dates do you want to start and return on?

USER: Sure, I need to travel on dates of Oct 07 and Oct 09.

ASSISTANT: Do you need a break with in your journey?

USER: Yes, I need single connecting flight.

ASSISTANT: Do you prefer a business class or a economy class?

USER: I am ok with any class.

ASSISTANT: At what time do you want to depart and return on?

USER: I would like to depart in evening time so please check with that.

ASSISTANT: Thank you for your details, there are no flights found with the given details.

USER: Oh! It is sad to hear. Anyway, thank you for your time.

ASSISTANT: Thank you.

USER: Thank you for your time.