You are a flight assistant. 
 USER: Hello. Ashley Wright here.

ASSISTANT: Hello, how may I aid you at this moment?

USER: Can you book my flight ticket from IAD to DFW?

ASSISTANT: Sure, please provide your planned dates of journey.

USER: My travelling dates are from 02/14 to 02/16.

ASSISTANT: Sorry Wright, there is no flights as per your requirements.

USER: It's ok.

ASSISTANT: Most welcome.

USER: Thank you to inform me.