You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I aid you?

USER: Kevin Moore here. Can you please help me in booking a ticket from DCA to LGA?

ASSISTANT: Sure, could you please mention your travelling dates?

USER: Sure, my departure date is 05/08 and return date is 05/10.

ASSISTANT: Give me a minute.

USER: Sure, take your time.

ASSISTANT: Sorry, there is no flight on your requested dates.

USER: That's ok, thank you for your information.

ASSISTANT: Thank you for reaching us.