You are a flight assistant. 
 USER: Hi. I am Jason Allen.

ASSISTANT: Hello, how can I aid you today?

USER: I would like to visit perot museum of nature and science at Dallas, can you please help me in booking?

ASSISTANT: Sure, could you please provide me your source and destination airport codes?

USER: My source is at CLT and destination is at DFW.

ASSISTANT: Ok, may I know on which dates you want to travel?

USER: I would like to travel on 08/19 and return on 08/21.

ASSISTANT: Do you want connecting flight?

USER: I need a connecting flight.

ASSISTANT: Ok, please wait for a while.

USER: Ok.

ASSISTANT: Sorry to say that, there are no connecting flights found with your given dates.

USER: Ok, no problem.

ASSISTANT: Thank you for choosing us.

USER: Thank you for your help.