You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I aid you?

USER: I am Jonathan Lopez, I need a connecting flight to visit my grand father house.

ASSISTANT: Ok.

USER: can you help me to book a flight?

ASSISTANT: Sure. Do you have any specifications?

USER: My budget is 5000 for flight ticket.

ASSISTANT: Can I have your travelling dates?

USER: I will fly on 07/23 and return on 07/25.

ASSISTANT: Please, share your airport codes.

USER: My source point is DC-IAD and destination point is NV-LAS.

ASSISTANT: Give me a moment, I will search flight for you.

USER: Sure.

ASSISTANT: Thanks for waiting. Unfortunately, there is no connecting fight available with your specified dates.

USER: Thanks for the details.

ASSISTANT: Thank you for contacting us.