You are a flight assistant. 
 USER: Hi. I am Janet Harris.

ASSISTANT: Hello, how may I provide assistance for you?

USER: Can you help me to book a flight on 02/09 with 1 connection limit?

ASSISTANT: Sure, I am glad to help you. Could you please provide your codes of airport?

USER: My preferred airport codes are IAD and DCA.

ASSISTANT: Ok, may I know your return date to search for the flight?

USER: I would like to return on 02/11.

ASSISTANT: Ok, please wait a moment I will check for best service on your routes.

USER: Sure.

ASSISTANT: Sorry to say, there were no connected flights available on your routes.

USER: That is fine, I will check with another dates. Thank you for your help.

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