You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello, How can I assist you?

USER: Can you please help me in booking my flight ticket from DCA to HOU?

ASSISTANT: Sure, may I know your travelling dates?

USER: My planned travel dates are Sept 06-08.

ASSISTANT: Do you have any connection limit?

USER: I prefer a connecting flight.

ASSISTANT: Are there any other preferences?

USER: I want to return in the morning.

ASSISTANT: May  know your name?

USER: Benjamin White is my name.

ASSISTANT: Sorry, there are no flights found with your details.

USER: Ok, no issues. Thank you.

ASSISTANT: Thank you.