You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, may I know your good name please?

USER: I am Sarah Gonzalez.

ASSISTANT: Ok Sarah, how may I assist you?

USER: I just want to meet my friend, can you help me to book a flight?

ASSISTANT: Sure, can you please share your prefered dates?

USER: I am planning in weekends, they are 02/26 and 02/28.

ASSISTANT: Ok, what are the source and destination airport codes?

USER: My locations are IAD and DFW.

ASSISTANT: Ok.

USER: Make sure that my price limit is 200 with 1 connection.

ASSISTANT: Sorry to inform you Sarah, there are no flights in the dates you given.

USER: Ok, that's fine.

ASSISTANT: Thank you for contacting us. Have a good day.

USER: Thank you for your service.