You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Thomas Williams.

ASSISTANT: How can I help you at this moment?

USER: Please book me a ticket from LAS to DCA to meet my family.

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

USER: I have planed to travel on 12/28 and 12/30.

ASSISTANT: Ok, please hold on a moment, I will check flight availability in this route.

USER: Ok, I will wait.

ASSISTANT: Southwest airline is ready to serve you with 1 connection with a minimum fare of 100 is available for you. Shall I proceed with this?

USER: Yes, please book this ticket.

ASSISTANT: Your flight ticket is booked successfully, flight number is 1028.

USER: Thank you.

ASSISTANT: Thank you for reaching us.