You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: My name is John Jackson.

ASSISTANT: How may I aid you?

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

ASSISTANT: Sure, can you please share your travel dates?

USER: My travel dates are 07/05 and 07/07.

ASSISTANT: Do you have any connection limit?

USER: I need a single connecting flight.

ASSISTANT: May I know your airline preference?

USER: No.

ASSISTANT: Which class do you prefer?

USER: I am comfortable with any class.

ASSISTANT: Do you have any specific depart or arrival time?

USER: I would like to return in the morning.

ASSISTANT: Ok, please be on hold for a moment.

USER: Ok.

ASSISTANT: Sorry, there are no flights in this route as per your travelling details.

USER: Ok, thank you for the information.

ASSISTANT: Thank you for choosing us.