You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: I am planning to celebrate my sister birthday at Washington, can you help me with booking?

ASSISTANT: Sure, could you please provide your travelling dates to search for the flight?

USER: My travelling dates are July 16 and July 18.

ASSISTANT: May I know your airport codes?

USER: My airport codes are LAS to DCA.

ASSISTANT: Can I know your connection limit?

USER: I am comfortable with any connection.

ASSISTANT: Let me know your name?

USER: I am Jessica Jackson.

ASSISTANT: There is a direct flight 1007 of Delta airlines, can I proceed?

USER: Please proceed.

ASSISTANT: Your booking is done.

USER: Thank you.

ASSISTANT: Welcome.