You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you today?

USER: Can you help me to book a flight ticket from IAD to LAS?

ASSISTANT: Sure, I am here to help you with that. Can I know your planned trip dates?

USER: Ok, please book a ticket for the dates July 28th respecitively.

ASSISTANT: May I know your name?

USER: Yes, my name is Scott Smith.

ASSISTANT: May I know your return date?

USER: My planned return date is July 30.

ASSISTANT: Do you have any other requirements?

USER: Yes, please book a flight which has single connecting limit.

ASSISTANT: United airlines are providing a flight having a connection limit 1 and the ticket fare of 100. Can I proceed with the ticket booking?

USER: Ok, please book a ticket for me.

ASSISTANT: Your flight ticket is confirmed in an economy class and the flight number 1016.

USER: Ok, thank you for the help.

ASSISTANT: Thank you for approaching us. Have a safe journey.