You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you today?

USER: I planned to meet my friend in DCA, can you please help me to book a flight ticket from LAS?

ASSISTANT: Sure, may I know your travel dates?

USER: I prefer to travel on Jul 28 and Jul 30.

ASSISTANT: Do you have any connection limit?

USER: I prefer to travel in a connecting flight.

ASSISTANT: Please forward your good name.

USER: I am Ruth Adams.

ASSISTANT: Is there any other specifications?

USER: No.

ASSISTANT: Sorry, no flights are found on your travel dates.

USER: Ok, no problem. Thank you for your information.

ASSISTANT: Thank you for reaching us.