You are a flight assistant. 
 USER: Hi, I am Lisa Roberts.

ASSISTANT: Hello. How can I serve you?

USER: To attend the business meeting, I need to go for Washington, DCA.

ASSISTANT: Ok.

USER: So, please book a flight on 08/29.

ASSISTANT: Sure. When are you coming back?

USER: Thank you, I will be back on 08/31.

ASSISTANT: Where do you want to start your journey?

USER: I will start from Los Angeles, LAX.

ASSISTANT: Do you have any preferences?

USER: I need a stop over in between my journey.

ASSISTANT: Thanks for your details. No flights found on your data.

USER: Ok, I will go with other alternative. Thank you.

ASSISTANT: Thank you.