You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Donna Nelson here.

ASSISTANT: How may I help you? Nice to meet you Donna.

USER: I have to host a program at LAS, can you book a ticket from EWR?

ASSISTANT: Sure, tell me your travel dates please?

USER: Sure, my planned departure and return travel dates are 28th and 30th of July.

ASSISTANT: Please wait for a moment.

USER: Sure, please search for direct flight only.

ASSISTANT: Sorry presently direct flight is not available.

USER: That's ok, thank you for your time anyways.

ASSISTANT: Thank you.