You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Stephanie Brown from San Francisco.

ASSISTANT: What kind of assistance do you need from our agency, Brown?

USER: I have planned a trip with my students to enjoy the holidays in water world in the middle of April month, so please reserve an advance flight ticket for me to Denver-DEN from my hometown San Francisco-SFO?

ASSISTANT: Sure, we are here to make your trip happy. May I know your dates of journey that you have planned for your trip?

USER: Actually, we have only three holidays in April, so we have to be there on 04/12 and return back to my hometown from Denver on 04/14.

ASSISTANT: Ok, please be on hold for a moment, let me check for the best flight availability in your route.

USER: Ok, first thanks for your assisting for me, I will wait for your response.

ASSISTANT: Thank you for your patience. Sorry for the inconvenience Brown, you have no flights to travel on your particular days of journey.

USER: Not a problem but I have expected a lot about your agency that I can get a flight for my journey. Anyways, I will go with another agency, thank you for the information which is provided by you.

ASSISTANT: Sorry, thank you for reaching our agency. Have a great day.