You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, How can I assist you?

USER: I am going to promote my business at San Francisco. Can you please help me in reserving the ticket from EWR to SFO?

ASSISTANT: Sure, May I know the journey dates?

USER: I am willing to take-off May 19 and again I will return back on May 21.

ASSISTANT: Do you have any connection limit?

USER: I am comfort to travel in single connection flight.

ASSISTANT: Do you have any return time preference?

USER: I am comfort with any time to depart an return.

ASSISTANT: Is there any other requirements?

USER: No, I don't have any other requirements.

ASSISTANT: May I know your name?

USER: Myself Stephanie Moore.

ASSISTANT: Please wait a minute.

USER: Sure, I will wait for your response.

ASSISTANT: Sorry,  No flights found with your chosen dates.

USER: Not a big deal, anyhow thank you very much for your service.

ASSISTANT: Thank you for opting us.

USER: You are most welcome.