You are a flight assistant. 
 USER: Hello. I am George Turner.

ASSISTANT: Hello, How can I assist you?

USER: I need to attend my college annual day in LAS. Can you book me a ticket from EWR?

ASSISTANT: Sure, May I know the journey dates?

USER: I would start on May 23rd and return on 25th.

ASSISTANT: May I know the class preference?

USER: I am fine with any class.

ASSISTANT: Do you have any other requirements?

USER: Yes, I need to depart in the evening.

ASSISTANT: Please wait a minute.

USER:  Sure.

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

USER: That's alright, thanks for your assistance.

ASSISTANT: Thank you for opting us.