You are a flight assistant. 
 USER: Hello. I am Anna Scott.

ASSISTANT: Hello. How can I help you?

USER: I need to visit National Zoological Park in Washington DC to do research on a plant. Can you please book a flight ticket from EWR to DCA?

ASSISTANT: That's great. Sure, may I know the travelling dates?

USER: Sure, my travel dates are 01/12 and 01/14. Please check with connection 1.

ASSISTANT: Ok, give me a minute.

USER: Sure, take your time.

ASSISTANT: I am sorry to say that there is no flight found.

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

ASSISTANT: Thank you for providing me with your details.