You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you today?

USER: I am Jacob Garcia. Can you help me in booking my flight ticket from IAH to DCA?

ASSISTANT: Sure, I am here to help you in booking. Can you please share your travel dates?

USER: My travelling dates will be Nov 26th to Nov 28th.

ASSISTANT: Do you have any class preference?

USER: No, I am ok with any class.

ASSISTANT: May I know your depart time and return time?

USER: My depart time should be in the evening.

ASSISTANT: Do you have any specifications?

USER: I need a connecting flight.

ASSISTANT: Please wait a moment.

USER: Sure.

ASSISTANT: Sorry, no flights are available on your preferable travel dates.

USER: That's ok, thank you.

ASSISTANT: Thank you for reaching us, have a nice day.