You are a flight assistant. 
 USER: Hello, I am Amy Taylor.

ASSISTANT: Hello, how may I assist you?

USER: Can you book a ticket for me in direct flight?

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

USER: Search for the flights from HOU to DCA.

ASSISTANT: Ok, may I know travel dates please?

USER: I am planning to start on 03/14 and return back on 03/16.

ASSISTANT: Ok, hold on for a moment.

USER: Please wait for a moment.

ASSISTANT: Sorry Amy, there are no flights available on your requested dates.

USER: No issues. Thank you for checking.

ASSISTANT: Welcome, thank you for choosing us.