You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Anthony Allen here.

ASSISTANT: Allen how may I assist you today?

USER: I want to travel from EWR to IAD, can you help me to find a flight?

ASSISTANT: Sure, may I know travelling dates?

USER: Sure, my travel dates are 08/23 and 08/25.

ASSISTANT: Sorry Allen, no flights as per your details.

USER: It's ok. Thanks for your helping.

ASSISTANT: Thank you for contacting us. Have a good day.