You are a flight assistant. 
 USER: Hi, I am Robert Lopez.

ASSISTANT: Hello, may I know how best I can help you today?

USER: I am planning to visit Chicago to meet my friend, can you please book me a flight ticket?

ASSISTANT: Ok, may I know your travel dates?

USER: My trip dates are from 02/07 to 02/09.

ASSISTANT: I need your airport abbreviates here?

USER: My journey starts from Washington, DC-IAD to Chicago, IL-ORD. Please make sure that I need a flight with a single connection.

ASSISTANT: OK. No connecting flights are available on your route.

USER: Ok, no problem. Thank you.

ASSISTANT: Thanks for reaching us, have a nice day.