What are some words other than talk to you again?

Rather than say 'talk to you again', you can say:

• Goodbye - a perfectly good way to end a conversation, especially formal communications.
• Thank you for your time, goodbye. - formal
• I appreciate your time. - formal
• This information has been very helpful. Thank-you, goodbye. - formal
• Bye - to end a personal conversation.
• until later - personal conversation
• Talk to you later - personal
• Catch you later (or... tomorrow, next week) - personal
• We'll be in touch - personal, or a close business colleague