How to delete a conversation on the Facebook iPhone app?

Need to delete a conversation on Facebook app. All it says is archive when I try and it doesn't delete it completely with that person, how do I do it?

Its very good qustion but i have no idea about it.

You can't delete it.

If you want to delete a conversation, follow what is written below

smart phones
1. Tap photo (top left of any page)
2. Select the messages
3. Tap the conversation you want to delet
4. Hit delet conversation

other phone
1. Click messages at the bottom of every page
2. Click the message you want to delete
3. Tap delete conversation
3.

Tap The Conversation than the Delete Option should appear i think its to the right or the left or something like that than Hit Delete and it Should be Deleted

Watch this video and get the desire answer