You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, How can i aid you?

USER: I would like to travel from SFO to DFW, can you please help me in booking my flight ticket?

ASSISTANT: Sure, may I know your travelling dates?

USER: Thank you. I will depart on July 19th and return back on July 21st.

ASSISTANT: Do you have any connection limit?

USER: I am looking for a connecting flight.

ASSISTANT: May I know your name?

USER: My name is Larry King.

ASSISTANT: Sorry, there are no flights found with your details.

USER: Not an issue. Anyway, thank you for checking.

ASSISTANT: Thank you.