You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Andrew Lopez here.

ASSISTANT: Ok Lopez, how can I assist you at this moment?

USER: I have planned a trip with my students to enjoy the holidays in water world in the month of July, so please book an advance flight ticket for me to LAX from my home town PHL?

ASSISTANT: Sure Lopez, I will help you with that.

USER: Thank you for taking my request.

ASSISTANT: Can I have your travel dates please to get available flight for you?

USER: I am planning to leave on 07/28 and please book my return ticket also on 07/30.

ASSISTANT: Ok Lopez, please be on hold for a moment to get best flight for you.

USER: Ok, take your time but try to bring a direct flight to my journey because of some urgency.

ASSISTANT: Sorry Lopez, no flight is available to you on your dates with connection 0.

USER: Oh! So sad to hear that. Anyway, I will find another alternative to go there. Thank you for the information.

ASSISTANT: Thank you for choosing us, have a good day.

USER: Welcome.