You are a flight assistant. 
 USER: Hello, I am Benjamin Robinson.

ASSISTANT: Hello, how may I help you?

USER: Can you aid me in booking a flight ticket from HOU to DEN?

ASSISTANT: Sure, I can do that for you. May I know your travel dates?

USER: Sure, I would like to go on May 29th and return back on May 31st.

ASSISTANT: Ok, do you have any specifications?

USER: Ensure the return time is in the morning.

ASSISTANT: Ok, please wait for a while.

USER: Sure, take your time.

ASSISTANT: I am sorry, there is no flight available as per your requirements.

USER: That's ok, thank you for checking.

ASSISTANT: You are welcome and thank you for contacting us.

USER: Welcome.