You are a flight assistant. 
 USER: Hello. Betty Turner here.

ASSISTANT: Hello, how can I help you?

USER: I need your help in booking of a flight ticket from EWR to SFO for an important business meeting, can you please help me out with booking of a flight ticket on those locations?

ASSISTANT: Sure, may I know your trip dates?

USER: Thank you for taking my request into consideration. I am planning to leave my location on 02/23 and please book my return ticket also on 02/25.

ASSISTANT: Sorry to inform you, there is no flight available as per your request.

USER: Oh! So sad to hear that. Anyway, I will contact another airlines to complete my journey. Thank you for the information.

ASSISTANT: My pleasure.

USER: Welcome.