You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, do you need any help from us?

USER: I want to book a flight ticket which return in the evening. Could you please help me with booking a flight ticket?

ASSISTANT: Sure, could you please share your departure and arrival day?

USER: Sure, my travelling dates are July 30 and Aug 1.

ASSISTANT: Ok, may I know your location airport codes?

USER: Sure, my airport codes are JFK and IAH.

ASSISTANT: Ok, could I have your name please?

USER: I am William Martin.

ASSISTANT: Ok, do you need direct or connecting flight?

USER: I prefer to travel in a connecting flight.

ASSISTANT: Ok, do you have any other specifications?

USER: I want to travel in a economy class.

ASSISTANT: Sorry, there is no flight on your requested travelling dates.

USER: No worries, thank you for the information.

ASSISTANT: You are welcome.