You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you ?

USER: My name is Kenneth Young. I am planning to meet my family in HOU from DEN, can you please book me the flight ticket?

ASSISTANT: Can I know your travelling dates?

USER: My travelling dates are from 02/25 to 02/27. I need direct flight.

ASSISTANT: Sorry Kenneth, I didn't found any direct flight for you. Anyways, thank you to join us.

USER: It's ok. Thank you for your help.

ASSISTANT: Most welcome.