You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I assist you today?

USER: I am Joshua Anderson, would like to travel to IAH in a direct flight. Can you help me in booking?

ASSISTANT: Sure, can you please share your travel dates?

USER: My preferred trip dates are 11/15 and 11/17.

ASSISTANT: Could you please help me with the Source airport code?

USER: My source airport is LGA.

ASSISTANT: Let me check for the availability of flight.

USER: Sure.

ASSISTANT: Joshua, I am sorry to inform you that there is no flight available at your requested dates.

USER: Ok, no issues. Thank you for your help.

ASSISTANT: Thank you for contacting us.