You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you?

USER: Alexander Campbell here. I am a chemistry professor, I have to deliver a lecture at Minneapolis. Please book my ticket from DFW to MSP.

ASSISTANT: Sure, can you help me with your travelling dates?

USER: My itinerary dates are 05/14 and 05/16.

ASSISTANT: Do you have any requirements?

USER: I want a connecting flight.

ASSISTANT: Sorry, there is no flight is available for you.

USER: It's ok, thank you.

ASSISTANT: Thank you for choosing us, have a nice day.