You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, How can I help you?

USER: Can you please help me in flight ticket booking process from SFO to IAD?

ASSISTANT: Please provide me your itinerary travel dates.

USER: Thank you for your response, I want to take off on Feb 21 and book my return ticket also on Feb 23.

ASSISTANT: Is there any connection limit?

USER: I will prefer 1 break in between my journey.

ASSISTANT: Are there any more preferences that you want to avail?

USER: I want to return in evening time.

ASSISTANT: May I know your name please?

USER: Sure, my name is Robert Moore.

ASSISTANT: Give me a moment.

USER: Ok.

ASSISTANT:  Robert Moore. I regret to inform that there are no flights on your route with the given dates.

USER: Oh! It's ok, no problem.

ASSISTANT: Thank you for reaching us.

USER: Thank you for your information.