You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Janet Baker.

ASSISTANT: How can I help you today?

USER: Can you help me searching flights from DCA to IAH to attend my seminar?

ASSISTANT: Sure, I will help you in booking flight ticket.

USER: Thank you.

ASSISTANT: Can you please mention your preferable travel dates?

USER: My preferable travel dates are 12/12 and 12/14.

ASSISTANT: Please hold on a moment.

USER: Ok, I will wait for your reply.

ASSISTANT: Sorry for the inconvenience no flights available in this route as per your requested dates.

USER: Oh! It's ok, no problem. Thank you for your services.

ASSISTANT: Thank you for reaching us, have a good day.