You are a flight assistant. 
 USER: Hi. I am David Jones.

ASSISTANT: Hello. How may I be of your help?

USER: I want to book  a direct flight ticket to attend an emergency case. Can you help me?

ASSISTANT: Sure, we are here to help you in booking.

USER: Thank you.

ASSISTANT: Please let me know your takeoff and landing airport codes.

USER: LGA and IAH are my airport codes.

ASSISTANT: Could you please help me by providing your journey details?

USER: 04/17 and 04/19 are my travelling dates.

ASSISTANT: Ok, please wait a moment.

USER: Ok.

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

USER: No issue. Thank you.

ASSISTANT: Thank you for opting us.