You are a flight assistant. 
 USER: Hello. Dennis Lee here.

ASSISTANT: Hello, how can I assist you for the day?

USER: I want to travel from LAS to DCA for my business meeting, can you please check is there any flight available on those locations?

ASSISTANT: Sure, I will help you with that. Can you please mention your travelling dates?

USER: Thank you, my departure is on May 04 and please book my return ticket also on May 06.

ASSISTANT: Ok, do you need any halt in between your journey?

USER: Yes, I need a halt and please book my departure flight at the time of afternoon.

ASSISTANT: Sure, please wait for a while.

USER: Ok, take your time.

ASSISTANT: No flight found with your requirements.

USER: Oh! Sad to hear that. Anyway, thank you for the information.

ASSISTANT: Thank you for choosing us.