You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you today?

USER: Can you please make a reservation from LAS to DCA to attend a marriage in Washington?

ASSISTANT: Sure, may I know your good name?

USER: My name is Catherine Thomas.

ASSISTANT: Could I have your trip dates, please?

USER: My journey dates are on July 30th and Aug 1st.

ASSISTANT: Do you have any preferences?

USER: I need a direct flight.

ASSISTANT: Sorry, there are no flights available as per your requirements.

USER: Ok, no problem. Thank you.

ASSISTANT: Thank you for choosing us.