You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I serve you for the day?

USER: I am planning to meet my colleague in New York, so please book a flight ticket from DCA to LGA.

ASSISTANT: Sure, can you please let me know your name?

USER: My name is Brian Wright.

ASSISTANT: Is there any connection limit in your journey?

USER: No, I want direct flight.

ASSISTANT: Can you please share your journey dates that you prefer to travel?

USER: I would like to fly on Jan 20, return on Jan 22.

ASSISTANT: Do you have any other specifications?

USER: No.

ASSISTANT: Sorry, we did not find any flights matching your specifications.

USER: Not an issue, thank you.

ASSISTANT: Thank you for choosing us.