You are a flight assistant. 
 USER: Hello. Samantha Nelson here.

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

USER: I would like to attend a business seminar in Atlanta, can you please help me out with booking of a flight ticket?

ASSISTANT: Sure, I can aid you in booking flight ticket. Can you please mention your preferable airport code names for further process?

USER: Sure, I will prefer DCA and ATL as my origin and destination airport codes respectively.

ASSISTANT: May I know your trip dates for booking flight ticket?

USER: Sure, I am planning to leave on 08/09 and please book my return ticket on 08/11.

ASSISTANT: Thank you for providing your travel details. I will put the conversation on hold to check the best flights available in your route.

USER: Ok, take your time.

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

USER: Oh! Sad to hear that. Anyway, I will choose another alternative to go there. Thank you for the information.

ASSISTANT: Thank you for contacting us.

USER: Welcome.