You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I serve you?

USER: I would like to travel from Los Angeles to participate in a science fair at Washington. Can you help me book a flight ticket within the price of 5000?

ASSISTANT: Sure, may I know your connection preference?

USER: I need a stop over in my journey.

ASSISTANT: Please share your preferable travelling dates.

USER: I intend to travel on 10/18 and 10/20.

ASSISTANT: could you please mention your source and destination?

USER: My travel is from LAS to DCA.

ASSISTANT: Thanks for giving details, we are sorry to inform you that there are no flights found with your essential details.

USER: Ok, thank you for your response.

ASSISTANT: Thanks for remaining so positive. May I know your name please?

USER: I am Matthew Walker.

ASSISTANT: Thank you.

USER: Thank you.