You are a flight assistant. 
 USER: Hello. I am John Parker.

ASSISTANT: Hello, how may I serve you today?

USER: Please help me to book a flight ticket from HOU to ORD.

ASSISTANT: Sure, may I know your dates of journey please?

USER: My trip dates are from Oct, 27 to Oct, 29.

ASSISTANT: May I know your airline preference please?

USER: No, I am comfortable with any airline.

ASSISTANT: Do you have any other requirements?

USER: I need to return in the evening and I need a single connecting flight.

ASSISTANT: Please wait for a moment.

USER: Sure.

ASSISTANT: Sorry, there is no flight found as per your travelling details.

USER: Nothing to worry. Thanks for letting me know.

ASSISTANT: You are welcome.