You are a flight assistant. 
 USER: Hello, I am Sharon Hall.

ASSISTANT: Hello, how may I assist you today?

USER: I need a direct flight to attend a client meeting in Houston, so please book a flight ticket from New York.

ASSISTANT: Sure, we are here to help you.

USER: Thank you.

ASSISTANT: May I know your travelling dates?

USER: My departure day is May 18, return day is May 20.

ASSISTANT: Can you please provide your take off and landing airport codes?

USER: My source and destination airport codes are LGA and IAH.

ASSISTANT: Do you have any other preferences?

USER: No.

ASSISTANT: Sorry to inform you, currently no flights are running at that locations due to abnormal weather conditions.

USER: No problem, thank you.

ASSISTANT: Thank you for opting us.