You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. In which way I can aid you today?

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

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

USER: My preferable dates are Nov 17 and Nov 19.

ASSISTANT: May I know your name for further process?

USER: Myself Thomas Wilson.

ASSISTANT: Do you need any specific depart and arrival time for this trip?

USER: No, I am fine with any time.

ASSISTANT: Do you have any another specifications?

USER: No, other specifications. Thank you for asking.

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: No issue, anyway thank you for checking.

ASSISTANT: Thank you for reaching us.