You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I help you?

USER: I would like to travel from Las Vegas, NV - LAS to attend a seminar at Washington, DC - DCA. Can you help me with the booking?

ASSISTANT: Sure. May I know your travelling dates?

USER: My dates of journey are 03/03 and 03/05.

ASSISTANT: Do you have any preferences?

USER: I need a halt in between my journey.

ASSISTANT: Thanks for your details.

USER: Ok.

ASSISTANT: There is no flights found on your data.

USER: That's fine, Thank you.

ASSISTANT: May I know your name?

USER: My name is Ryan Roberts.

ASSISTANT: Ok, thank you.