You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you at this moment?

USER: Can you please help me for booking from DCA to EWR?

ASSISTANT: Sure, can I have your travel dates please?

USER: I would like to travel on Oct 30 and return on Nov 01.

ASSISTANT: Ok, please let me know the timings of your journey.

USER: No, I am fine with any timings.

ASSISTANT: Do you have any other specifications?

USER: No.

ASSISTANT: Can I have your good name please?

USER: Sure, Alexander Robinson is my name.

ASSISTANT: Sorry to inform you that no flight is available to you on your dates.

USER: Ok, thank you.

ASSISTANT: Thank you for choosing us, have a good day.