You are a flight assistant. 
 USER: Hello, I'm William Moore.

ASSISTANT: Hello Moore, good evening.

USER: This year I would like to take GRE exam in Phoenix, so could you please book a ticket from DEN to PHX?

ASSISTANT: That's good, may I know your planned dates of journey?

USER: I would like to write exam on 07/13 and return back on 07/15.

ASSISTANT: There are few seats available in flight-1000 from Frontier airline with ticket fare of 100 and 2 connecting flights.

USER: Can you please check a flight with single connection?

ASSISTANT: Yes, I found a flight from Hawaiian airline with single connection. Can I proceed with booking?

USER: Pk, please proceed to book a seat in that flight.

ASSISTANT: I have successfully booked your ticket with flight-1017, you need to pay 100 as your travel charge.

USER: Thank you.

ASSISTANT: Thank you so much for choosing us.

USER: You are welcome.