You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you today?

USER: My name is Mathew Walker. I would like to book a ticket from IAH to DTW.

ASSISTANT: Sure, I will help you. Please help me with your planned travel dates.

USER: My travel dates are Oct 18 and Oct 20.

ASSISTANT: Please help me with your preferred depart and arrival time.

USER: My return time should be in the afternoon.

ASSISTANT: Do you need a direct or connecting flight?

USER: I would like to board a single connection flight.

ASSISTANT: Do you have any other preferences in your journey?

USER: No. I have none.

ASSISTANT: Mathew Walker, I am really sorry to inform you that there is no active flight available for your journey.

USER: No problem, thank you for the help.

ASSISTANT: Thank you for reaching us. Have a great time.