You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you today?

USER: I am Robert Brown. Can you help me in booking a flight ticket with a direct flight?

ASSISTANT: Sure, may I know your source and destination airport codes?

USER: My source code is DTW, my landing airport code is LGA.

ASSISTANT: Can you please share your planned travel dates?

USER: My planned trip dates will be Feb 4th and Feb 6th.

ASSISTANT: Do you have any other requirements?

USER: No.

ASSISTANT: Ok, please wait for a while.

USER: Sure.

ASSISTANT: Sorry, there are no flights found with your given details.

USER: Its ok, thank you.

ASSISTANT: Thank you for opting us.