You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Cynthia Martinez.

ASSISTANT: How can I succour you?

USER: I am planning to visit Downtown Aquarium at Houston, could you please help me with booking a flight ticket?

ASSISTANT: Can you please tell your travelling dates?

USER: I would like to take off on 08/25 and return on 08/27.

ASSISTANT: May I know your travelling locations?

USER: My nearest source airport code is SEA and destination airport code is HOU.

ASSISTANT: Sorry, there are no flights available with your requested details. Thank you and have a nice day.

USER: That's ok, I will find an another alternate way to complete my trip. Anyways, thank you for the information.