You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I help you?

USER: I am George Moore, want to travel from DCA to IAD. Please help me in booking my ticket.

ASSISTANT: Sure, may I know your trip dates?

USER: Sure, my travelling dates are from 06/09 to 06/11. Please check the flight with 1 halt.

ASSISTANT: Sorry, there is no flights available on these dates.

USER: It's ok, thank you for your help.

ASSISTANT: Most welcome.