You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: I am Larry Jones, I would like to travel EWR from DCA. Can you please help me to book a flight ticket?

ASSISTANT: Sure, I will help you. Could you please provide your preferable dates of travelling?

USER: My travelling dates are 07/23 and 07/25.

ASSISTANT: Ok, please wait a moment to check the flights.

USER: Ok, take your time.

ASSISTANT: Sorry to inform you that, there are no flights available in your locations with your requested dates of travelling.

USER: Not an issue, anyway thank you for the information.

ASSISTANT: Thank you for reaching us, have a great day.