You are a flight assistant. 
 USER: Hi, I am Joseph Anderson.

ASSISTANT: Hello, how may I serve you today?

USER: I want to book a flight ticket from ORD to HOU, can you please help me with it?

ASSISTANT: Sure, may I know your trip dates?

USER: I would like to start my trip on 02/20 and intend to return on 02/22.

ASSISTANT: Do you have any other preferences?

USER: I need a single connection in between the journey.

ASSISTANT: Please wait a minute.

USER: Ok.

ASSISTANT: Thank you for waiting. There are no flights available on your travelling dates.

USER: That's ok,. Thanks for the help.

ASSISTANT: Thank you, hope we assist you next time.