You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Margaret Thompson.

ASSISTANT: How can I help you today?

USER: I am looking for a flight from ATL to DCA, can you help me with booking?

ASSISTANT: Sure, I will help you in booking flight ticket. Can you please mention your preferable travel dates for booking flight ticket?

USER: Ok, my trip dates should be 05/14 and 05/16.

ASSISTANT: Ok, please wait for a moment.

USER: Ok.

ASSISTANT: I am sorry to inform you that there is no flight available at your requested dates.

USER: It's ok, thanks for your information.

ASSISTANT: Thank you for choosing us.