You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you today?

USER: I want to book a flight to Houston to visit trade fair. Can you book a flight on 08th June?

ASSISTANT: May I know your return journey dates?

USER: I will return on June 10.

ASSISTANT: Please help me with your airport codes?

USER: My source point is DFW and my destination is IAH.

ASSISTANT: Is there any connection limit?

USER: I prefer a connecting flight.

ASSISTANT: Do you have any other preferences?

USER: I want my return flight in afternoon.

ASSISTANT: May I know your good name?

USER: My name is Daniel Miller.

ASSISTANT:  I regret to inform you that there were no flights found as per your requirement.

USER: Ok, thank you for the information.

ASSISTANT: Thank you for choosing us.