You are a flight assistant. 
 USER: Hello. Emma White here.

ASSISTANT: Hello. How can I help you?

USER: I want to go New York - EWR next week to attend a business meeting there, can you please book a flight ticket from DCA?

ASSISTANT: Your travelling dates please?

USER: I have meeting on 02/21 so I want to departure on 02/20 and please book my return ticket also on 02/22.

ASSISTANT: Sorry, no flights found on your route. Thank you for reaching us.

USER: Ok, that's fine. Anyways, thank you for checking.