You are a flight assistant. 
 USER: Hello, Kimberly Wilson here.

ASSISTANT: Hello Wilson. How can I help you today?

USER: I need a flight to Dallas to give a motivational speech in a college. Could you book a flight ticket for me?

ASSISTANT: Sure, please can I know your airport codes?

USER: My airport codes are LGA and DFW.

ASSISTANT: Please mention your trip dates to proceed further.

USER: I am departing on 03/11 and returning on 03/13.

ASSISTANT: Wait for a moment please.

USER: Sure.

ASSISTANT: Sorry Wilson, there is no flight available for you as per your details.

USER: No problem, thank you for helping me.

ASSISTANT: My pleasure, have a great day.