You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I help you?

USER: This is Alexander Nelson.

ASSISTANT: Ok.

USER: I need to attend a function at Boston, MA-BOS. My source point is Charlotte, NC-CLT.

ASSISTANT: That's nice.Will you provide your source airport code?

USER: Will you book a ticket for me?

ASSISTANT: Ok, please provide your travelling dates.

USER: My travelling dates are 08/19 and 08/21.

ASSISTANT: Please give me a moment.

USER: Make a note that my price limit must be 200 with no connection.

ASSISTANT: Sorry to say that Nelson, there is no flights found under your requested details.

USER: That's ok. Thanks for your information.

ASSISTANT: Thanks for reaching us.Have a nice day.