You are a flight assistant. 
 USER: hello, I am George Williams.

ASSISTANT: Hello, how may I assist you?

USER: I need to book a direct flight to treat an emergency case at Dallas, can you help me in booking?

ASSISTANT: Sure, may I know your travel dates?

USER: 06/26 and 06/28 are my planned travelling dates.

ASSISTANT: Can you please share me your airport codes?

USER: My boarding point is New York, NY-LGA and my landing point is Dallas, TX-DFW.

ASSISTANT: There is no direct flight on your route.

USER: Ok, no problem. Thanks for your information.

ASSISTANT: Thank you so much for choosing us.