You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I be of your service?

USER: I would like to book a ticket from JFK to HOU, can you please help me out?

ASSISTANT: Sure, we are glad to assist you in booking. Help me with your journey dates, so that it will be easier to move further in booking.

USER: I am travelling on these dates July 21st and 23rd.

ASSISTANT: Would you like to travel in a connecting flight or a direct flight?

USER: I need single connected flight.

ASSISTANT: Can I have your name please?

USER: Shirley Robinson here.

ASSISTANT: Is there any other preferences that you would like to add before booking?

USER: I prefer departure in the evening.

ASSISTANT: Let me check the availability of flights and revert to you.

USER: Sure.

ASSISTANT: Thank you for waiting. Sorry there are no flights found with your essential details.

USER: Ok no problem, thank you for your services.

ASSISTANT: Thank you for approaching us.