You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: I am Jonathan Campbell. Could you please help me in booking a flight ticket to SFO from HOU?

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

USER: I want to travel on Apr 25 and return on Apr 27.

ASSISTANT: Ok, may I know your departure and arrival time?

USER: I want to return in the morning.

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

USER: I need a connecting flight.

ASSISTANT: Ok, please allow me a moment.

USER: Sure.

ASSISTANT: Sorry, there is no flight with your requests.

USER: Not a problem, thank you for your information.

ASSISTANT: You are welcome, have a great day.