You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: Patricia Rodriguez here. I need a direct flight for my journey, can you please reserve a flight ticket from HOU to DTW?

ASSISTANT: Sure, we are here to help you. Can you share me your trip dates?

USER: Thank you, my departure is on July 25 and please book my return ticket also on July 27.

ASSISTANT: Is there any class preference for you?

USER: No but please check my departure flight at the time of afternoon.

ASSISTANT: Please wait for a while.

USER: Sure, take your time.

ASSISTANT: Thanks for your time, there are no flights available with your request.

USER: Oh! So sad to hear that. Anyway, thank you for the information.

ASSISTANT: Thank you for reaching us.