You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you today?

USER: I planned to attend for a meeting in HOU, can you please help me to book a flight ticket from SEA?

ASSISTANT: Sure, may I know your travel dates?

USER: I prefer to travel on Apr 22 and Apr 24.

ASSISTANT: Is there any airline preference?

USER: No.

ASSISTANT: Any other requirement to be met?

USER: I need a direct flight.

ASSISTANT: Ok, can you mention your name to proceed further?

USER: I am Sandra Lee.

ASSISTANT: Sorry, no flights found as per your request.

USER: Ok, no problem. Thank you for your information.

ASSISTANT: Thank you for contacting us.