You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: I am Richard Campbell. I need to book a ticket from DCA to EWR to meet my friends. Could you please help me in doing that?

ASSISTANT: Sure, we are here to help you.

USER: Thank you.

ASSISTANT: Let me know when you are willing to travel?

USER: My travelling dates are 09/08 and return on 09/10.

ASSISTANT: Ok, wait for a while.

USER: Sure.

ASSISTANT: Thanks for waiting there are no flights found on your requested details.

USER: No problem, thank you for your information.

ASSISTANT: Thanks for approaching us.