You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. In which way I can help you at this moment?

USER: I want to book a flight ticket from ORD to DCA, can you please help me?

ASSISTANT: Sure, I will help you with that. Can you please mention your preferable travel dates?

USER: Thank you for your positive response, I planned my trip on the dates Dec 2 and Dec 4.

ASSISTANT: May I know your name for further process?

USER: Sure, please book the ticket on the name John Mitchell.

ASSISTANT: Do you have any preferences regarding timings of your journey?

USER: No, I am fine with any timings.

ASSISTANT: Do you have any another specifications?

USER: Yes, I am looking for a connecting flight.

ASSISTANT: Ok, please hold on a moment.

USER: Sure, I will wait for your response.

ASSISTANT: Sorry, no flights are available in this route as per your requested dates.

USER: That's fine, I will prefer any other service. Anyway thank you for checking.

ASSISTANT: Thank you for reaching us.