You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you at this moment?

USER: I am planning to book a ticket to meet my friend at IAH. Can you please help me out from IAD?

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

USER: I would like to travel on June 03 and return back on June 05.

ASSISTANT: May I know your name for further process?

USER: I am Susan Robinson.

ASSISTANT: Do you have any another specifications?

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

ASSISTANT: Do you have any preferences?

USER: No.

ASSISTANT: Ok, please hold on a moment.

USER: Sure.

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

USER: That's fine, thank you for your service.

ASSISTANT: Thank you for reaching us.