You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Daniel Hall.

ASSISTANT: How can I help you?

USER: Can you please reserve me a flight ticket from IAD to LAS to attend a film festival?

ASSISTANT: Can I know your travelling dates?

USER: My planned journey dates are Aug 30 and Sept 01.

ASSISTANT: Do you have any preference?

USER: My return time  should be morning.

ASSISTANT: Sorry, no flights found for your travelling dates.

USER: Ok, not an issue.

ASSISTANT: Thank you.

USER: Thank you for the information.