You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you today?

USER: Can you please help me to book a flight from DCA to IAH?

ASSISTANT: Sure, may I know your planned travel dates?

USER: My travel dates are Dec 20th and 22nd.

ASSISTANT: May I know your connection limit?

USER: I am fine with maximum one connection.

ASSISTANT: Is there any airline preference for you?

USER: No, but I want to depart in the morning time.

ASSISTANT: Do you have any other specifications?

USER: No.

ASSISTANT: Your good name please.

USER: My name is Eric Williams.

ASSISTANT: We found a direct airline: Southwest, flight number: 1016 and price is 200.

USER: Please proceed.

ASSISTANT: Your flight ticket has been reserved.

USER: Thank you for your help.

ASSISTANT: Thank you for reaching us.