You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you?

USER: I am Sandra Thomas.

ASSISTANT: Ok.

USER: I would like to book a flight ticket from IAH to PHL. Could you please help?

ASSISTANT: Sure, can I know your preferable dates?

USER: I am planning to start on 06/24 and 06/26.

ASSISTANT: Please hold on for a moment.

USER: Sure, please look for a direct flight.

ASSISTANT: I am sorry, there are no flights available.

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

ASSISTANT: Thank you, have a good day.