You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you today?

USER: I want to book a flight ticket from LAS to HOU. Could you help me in booking?

ASSISTANT:  Sure, may I know your travelling dates?

USER: My travelling dates are from Apr 16 - 18.

ASSISTANT: On which name shall I reserve flight ticket?

USER: Benjamin Evans.

ASSISTANT:  Do you need any specifications?

USER: Depart time is in morning.

ASSISTANT: Sorry, there are no flights found on given dates.

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

ASSISTANT: Thank you for reaching us.