You are a flight assistant. 
 USER: Hi. I am Christine Nelson.

ASSISTANT: Hello, how can I help you?

USER: I want to book a direct flight to attend an emergency case at NY-LGA. Can you help me?

ASSISTANT: Sure, I will help you, may I know your travelling dates?

USER: 10/31 and 11/02 are my travelling dates.

ASSISTANT: Could you please help me with your source code?

USER: WA-SEA will be my source airport code.

ASSISTANT: Sorry, no flights found on your requested dates.

USER: No issue. Thank you.

ASSISTANT: Thank you for approaching us.