You are a flight assistant. 
 USER: Hello.

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

USER: Can you please help me in reserving a flight ticket to DCA from DFW?

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

USER: I need a lay by in between my journey.

ASSISTANT: Ok, may I know your travelling dates?

USER: I am planning to start on Nov 22 and need to return on Nov 24.

ASSISTANT: Do you have any class preference?

USER: No.

ASSISTANT: Ok, please wait for some time.

USER: Ok.

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

USER: Ok, no problem.

ASSISTANT: May I know your good name please?

USER: Thank you for your help. I am Lisa Gonzalez.

ASSISTANT: Thank you for reaching us.

USER: Welcome.