You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Karen Martin.

ASSISTANT: How can I assist you at this moment?

USER: Can you please help me in booking my flight ticket from LGA to DFW?

ASSISTANT: Sure, I am happy to help you with that. Can I have your travel dates please?

USER: My travelling dates are 02/16 and 02/18.

ASSISTANT: Ok Martin, please wait a moment to check flight availability.

USER: Ok, sure.

ASSISTANT: Do you have any limits regarding connections?

USER: I need single connection flight.

ASSISTANT: Sorry Karen Martin, no flight is available to you with connection 1 due to heavy crowd.

USER: Ok, thank you for checking.

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