You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I aid you?

USER: I am Joshua Nelson, want to travel from CLT to DCA. Please help me in booking my ticket.

ASSISTANT: Ok, please help me with your travel dates.

USER: Sure, my travelling dates are from 12/14 to 12/16.

ASSISTANT: Please wait a moment.

USER: Sure.

ASSISTANT: Nelson, no flights has been found on your requested dates of journey.

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

ASSISTANT: Thank you for choosing us. Have a nice day.