You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I assist you?

USER: I am Donna Adams, can you help me to search a flight with 0 connection limit?

ASSISTANT: Sure, could you please provide your airport codes?

USER: My travelling airport codes are DCA and LAS.

ASSISTANT: Ok, may I know your travelling dates?

USER: I would like to travel on 02/22 and 02/24.

ASSISTANT: Sorry to say, I did not find any flights on your dates.

USER: That is fine.

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

USER: Thank you for your help.