You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Barbara Clark.

ASSISTANT: How can I assist you at this moment?

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

ASSISTANT: Sure, can you please provide your travelling dates?

USER: I would like to take off on 02/26 and return on 02/28.

ASSISTANT: May I know your nearest airport codes please?

USER: My source airport code is DTW and destination airport code is IAH.

ASSISTANT: Barbara Clark, there are no flight services available on this route on your provided dates.

USER: That's ok, I will find an another alternate way to complete my trip.

ASSISTANT: Thank you for contacting us.

USER: Anyways, thank you for the information.