You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello,.

USER: I am Ashley Martinez.

ASSISTANT: How can I be at your service?

USER:  I am planning a round trip to TX-HOU to visit Beer cane house. Can you book a direct flight?

ASSISTANT: Sure, on what dates you want to travel?

USER: My travel dates are 11/25 and 11/27.

ASSISTANT: Please wait for a while.

USER: Ok.

ASSISTANT: Thank you for waiting, sorry to inform you that unfortunately there are no flights available by the given details.

USER: Ok, thank you for your response.

ASSISTANT: Thanks for connecting with us.