You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. What can I do for you today?

USER: I need you to book a flight ticket from DFW and SFO.

ASSISTANT: Sure, may I know your travelling dates?

USER: February 15 and 17 are my planned travelling dates.

ASSISTANT: Ok, do you need any lay by in between the journey?

USER: Yes.

ASSISTANT: Do you have any other requirements?

USER: Noting much to state.

ASSISTANT: Can I have your good name please?

USER: My name is Linda Young.

ASSISTANT: There are no flights found on your requested dates.

USER: That's ok. Thank you.

ASSISTANT: Thank you for reaching us.