You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: I am Dennis Perez. Can you please book a flight ticket from DCA to BOS?

ASSISTANT: Sure, I will help you with that. Can I have your travel dates please?

USER: Sure, I need to travel on dates of 03/30 and 04/01.

ASSISTANT: Please wait for a moment.

USER: Sure, I will wait for your response.

ASSISTANT: No flight is available for you as per your requests.

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

ASSISTANT: Thank you for reaching us, have a nice day.