You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I aid you today?

USER: Can you please reserve a flight ticket from BOS to DCA for my business meeting?

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

USER: Thank you, my departure is on July 05 and please book my return ticket also on July 07.

ASSISTANT: May I know your name for further process?

USER: Sure, my name is Melissa Hill.

ASSISTANT: In which class do you want to travel?

USER: I will prefer economy class for my journey.

ASSISTANT: Are you ok with connecting flight or you need a direct flight?

USER: I am ok with connecting flight.

ASSISTANT: Ok, please hold on a moment.

USER: Sure, take your time but please book my departure flight in afternoon time.

ASSISTANT: Ok.

USER: Thank you.

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

USER: Oh! Sad to hear that. Anyway, I will find another alternative to complete my journey. Thank you for the information.

ASSISTANT: Thank you for reaching us.

USER: Welcome.