You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: I am Kenneth Parker. I want to book a flight ticket from IAD to IAH. Could you help me in booking?

ASSISTANT: Sure, please share your journey dates?

USER: My travelling dates are from July 12-14.

ASSISTANT: Do you have any other specifications to be met?

USER: My depart time should be in the evening and I need 1 connecting flight.

ASSISTANT: Are you looking for any class preferences?

USER: No.

ASSISTANT: Sorry, no flights found on your given details.

USER: That's ok, no problem. Thank you.

ASSISTANT: Thank you for choosing us.