Choose the correct, most natural-sounding responses according to the context of the conversation:
TICKET CLERK: Hi there! How can I help you today?
TICKET CLERK: Sure, one-way or return?
TICKET CLERK: That'll be £45. Would you like a seat reservation as well?
TICKET CLERK: It's just £2 extra. Here's your ticket — the train leaves from platform 9 at 3:15.
TICKET CLERK: Yes, it's on time so far. Have a safe trip!
TICKET CLERK: You too! Next, please!