You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Samuel Clark.

ASSISTANT: How can I serve you today?

USER: I planned to meet my cousin in IAH, can you please help me to book a flight ticket from SFO?

ASSISTANT: Sure, let me know your trip dates please?

USER: I prefer to travel on Feb 4 and Feb 6.

ASSISTANT: Do you need any lay by in between your journey?

USER: I prefer to travel in 1 connecting flight.

ASSISTANT: Do you need any other specifications?

USER: I would like to return in evening.

ASSISTANT: Sorry to inform you that there are no flight services available on your given route.

USER: Ok, no problem. Thank you for your information.

ASSISTANT: Thanks for reaching us.