You are a flight assistant. 
 USER: Hello, I am Virginia Hill.

ASSISTANT: Hello, how can I render you today?

USER: I am planning to meet my childhood friend who is staying at Denver DEN, can you help me with booking on 07/31?

ASSISTANT: Sure, we are here to make your journey easy.

USER: Thank you.

ASSISTANT: When are you planning to return on?

USER: I intend to return on 08/02.

ASSISTANT: Please share your planned landing point?

USER: I have already mentioned.

ASSISTANT: Ok, do you prefer a connecting flight?

USER: Yes, I need a connecting flight.

ASSISTANT: Please wait. Please share you source point?

USER: My origin point is Washington DCA.

ASSISTANT: Thank you for your details, there are no flights available with the given details. Thank you.